TWI547740B - Backlight module having a light shielding module and display device using the same - Google Patents

Description

Backlight module with light shielding module and display device using the same

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

In recent years, liquid crystal display devices have become the mainstream of various types of display devices. For example, home televisions, personal computers, laptops, monitors, mobile phones, and digital cameras are all products that use a large number of liquid crystal display devices. The backlight module used in the liquid crystal display device is used for supplying a light source with sufficient brightness and uniform distribution to enable the liquid crystal display device to display images normally.

The conventional liquid crystal display device 90 shown in FIG. 1 includes a panel module 80, a backlight module 10, a support frame 50, and a rear case 70. The backlight module 10 includes a light guide plate 20, an optical film group 30, a light source 40, and a reflection sheet 41. The backlight module is used, that is, the side of the light guide plate 20 enters the light end 22 and enters the light. , has the advantage of thin thickness. However, as shown in FIG. 1 , the light 91 emitted by the light source 40 of the backlight module 10 does not generate a total reflection light on the light exit surface 24 because the incident angle θ is smaller than the total reflection angle, so that the light guide plate 20 approaches the light. One end of the end 22 is ejected, and when the spacers 53, 54 of the positioning light guide plate 20 or the optical film group 30 are displaced, the light 91 will be separated from the light guide plate 20 and the spacer 53 or between the optical film group and the spacer 54. (not shown) leaks out or is directly refracted through the optical film group 30, thereby causing light leakage. On the other hand, due to the source 40 There is a gap G between the light incident end 22 and the light incident end 22, so that the light ray 92 may leak through the gap. The above backlight module and liquid crystal display device have improved space.

The main object of the present invention is to provide a backlight module and a display device including the same, which can reduce light leakage.

Another object of the present invention is to provide a backlight module and a display device therewith having a small bezel width.

The invention provides a backlight module, which comprises a light guide plate, a light source module and a light shielding module. The light guide plate has adjacent light incident surfaces and light exit surfaces, and the light source module is disposed corresponding to the light incident surface and has a gap with the light incident surface. The light-shielding module comprises a light-shielding substrate and a first reflective substrate, wherein the light-shielding substrate is disposed on the light source module and extends to cover the light-emitting surface, and the first reflective substrate is disposed on the bottom surface of the light-shielding substrate and located on the gap. The area of the first reflective substrate is not less than the area of the gap. The backlight module further includes an optical film set disposed on the light-emitting surface, and adjacent to the light-shielding module, forming a state of being successively disposed on the light guide plate.

The first reflective substrate extends further to cover the light source module. The light shielding module includes a glue layer disposed on a bottom surface of the light shielding substrate, adjacent to the first reflective substrate, and located between the light emitting surface and the light shielding substrate. The light shielding module further comprises a second reflective substrate disposed under the light source module and located at a projection position of the first reflective substrate and extending below the gap.

The display device includes the foregoing backlight module, the panel module, the support frame, and the rear case. The panel module is disposed on the light guide plate. The support frame surrounds the panel module, and the flange includes a flange located on a second side of the light shielding module opposite to the first surface. The rear shell and the support frame are co-shaped The space is provided to accommodate the backlight module and the panel module. The support frame further includes a spacer sandwiched between the flange and the second surface, the spacer is partially disposed on the light guide plate via the light shielding module, and the other portion is indirectly disposed on the first reflective substrate via the light shielding module. . The support frame further includes a spacer interposed between the flange and the optical film set.

The invention provides a backlight module and a display device therewith. In a preferred embodiment, the display device is a liquid crystal display; however, in various embodiments, the display device can be other displays that require a backlight.

As shown in FIG. 2A, the backlight module 100 of the present invention is used to form the display device 900 together with the panel module 800, the support frame 500, and the rear case 700. The rear case 700 and the support frame 500 together form an accommodating space 990 for accommodating the backlight module 100 and the optical film set 300. The backlight module 100 preferably adopts an edge-lighting light-in design, and includes a light guide plate 200, a light source module 400, and a light-shielding module 600, and preferably further includes a reflective sheet 410. The light guide plate 200 has adjacent light incident surfaces 220 and light exit surfaces 240. The light source module 400 is disposed corresponding to the light incident surface 220 , that is, adjacent to the light incident surface 220 , and has a gap G between the light incident surface 220 and the light incident surface 220 . The light source module 400 may include a light source such as a Light Emitting Diodes (LED) or a Cold Cathode Fluorescent Lamp (CCFL). The backlight module 100 further includes an optical film set 300 disposed on the light exit surface 240. In the preferred embodiment, the optical film set 300 is adjacent to the light shielding module 600 and is formed to be successively disposed on the light guide plate 200. In other words, optics The diaphragm group 300 is juxtaposed with the light shielding module 600 and is successively disposed on the light emitting surface 240.

As shown in FIG. 2A, the light-shielding module 620 includes a light-shielding substrate 620 and a first reflective substrate 640. The light-shielding substrate 620 is disposed on the light source module 400 and extends to cover the light-emitting surface 240. The reflective substrate 640 is disposed on the bottom surface of the light shielding substrate 620 and is located on the gap G. In other words, the light-shielding module 600 is partially disposed on the light-emitting surface 240 adjacent to the light-incident end 220 , and includes a light-shielding substrate 620 and a first reflective substrate 640 disposed on the first surface 621 of the light-shielding substrate 620 . The light shielding module 600 and the first reflective substrate 640 are preferably disposed in strips and extend along the sides of the light guide plate 200. The area of the first reflective substrate 640 is not less than the (projection) area of the gap G.

In the preferred embodiment, the light-shielding module 600 is disposed on the bottom surface of the light-shielding substrate 620 and adjacent to the first reflective substrate 640 and between the light-emitting surface 240 and the light-shielding substrate 620. The light shielding module 600 further includes a second reflective substrate 644 disposed under the light source module 400 and located at a projection position of the first reflective substrate 640 and extending below the gap G. The first reflective substrate 640 has a smaller area than the first surface 621, and the first surface 621 does not overlap the first reflective substrate 640, and has a glue layer 660 attached to the light-emitting surface 240. The reflective substrate 640 further extends to cover the gap G between the light source module 400 and the light incident end 220. The light-shielding module 600 preferably includes a glue layer 660 and a first reflective substrate 640 disposed on the first surface 621, and the glue layer 660 is connected to the first surface 621 and is not connected to the first reflective substrate on the light-emitting surface 240. 640 overlap. The refractive index of the adhesive layer 660 is preferably greater than or equal to the refractive index of the light guide plate 200. The thickness of the adhesive layer 660 is preferably not greater than or less than the thickness of the first reflective substrate 640, so that the light exit surface 240 is larger than the first reflective base. The reflective surface 641 of the material 640 is adjacent to the first surface 621.

As shown in FIG. 3, since the light-shielding module 600 is disposed on the portion of the light-emitting surface 240 adjacent to the light-incident end 220, the light 901 that would not be totally reflected on the light-emitting surface 240 because the incident angle is smaller than the total reflection angle will be shielded from light. The substrate 620 is directly shielded from being emitted from one end of the light guide plate 200 near the light incident end 220, and when the spacers 530, 540 of the positioning light guide plate 200 or the optical film set 300 are displaced to cause the light 910 to pass from the light guide plate 200 and the spacer A gap (not shown) between the 530 or the optical film group 300 and the spacer 530 leaks out to cause light leakage. On the other hand, since the first reflective substrate 640 extends to cover the gap G between the light source module 400 and the light incident end 220, the light ray 903 is shielded not only by the light shielding substrate 620 but also by the first reflective substrate 640. Therefore, it can be avoided that the gap G between the light source module 400 and the light incident end 220 leaks out. In other words, the arrangement of the first reflective substrate 640 not only solves the problem of light leakage occurring in the gap G between the light source module 400 and the light incident end 220, but also improves the utilization of light.

The first reflective substrate 640 can be a reflective coating or patch. In the preferred embodiment shown in FIG. 2A, the first reflective substrate 640 extends to completely cover the light source module 400, further reducing the likelihood of light leakage and increasing structural stability. However, in different embodiments, the first reflective substrate 640 may be covered as shown in FIG. 2B or only partially covered by the light source module 400 as shown in FIG. 2C, because of process convenience or material cost saving considerations, that is, The first reflective substrate 640 has an extended length that is at least greater than the width of the gap G, and can mask the gap G to reduce the occurrence of light leakage. The first reflective substrate 640 is preferably supported by the light source module 400. Further, one end of the first reflective substrate 640 of the light shielding module 600 is preferably a light source The module 400 is supported and the other end is supported by the light guide plate 200. Preferably, a double-sided tape or other connecting article is disposed between the first reflective substrate 640 and the light source module 400; however, in different embodiments, the first reflective substrate 640 itself may also have a slight adhesive force to the light source die. The group 400 is connected; or the first reflective substrate 640 is not in direct contact with the light source module 400, and a gap is interposed therebetween for heat dissipation.

As shown in FIG. 4 , the light shielding module 600 includes a second reflective substrate 644 , which is disposed along the reflective sheet 410 and is disposed on the rear case 700 and covers the gap G between the light source module 400 and the light incident end 220 . And facing the first reflective substrate 640 with a gap G therebetween. Thereby, the light 905 can be further prevented from leaking from the gap G between the light source module 400 and the light incident end 220 of the first reflective substrate 640, and the utilization of light can be improved.

As shown in FIG. 2A , the support frame 500 surrounds the panel module 800 , and the flange 510 is disposed on the second surface 622 of the light shielding module 600 opposite to the first surface 621 . Viewed from a different perspective, the flange 510 extends toward the center of the panel module 800. The panel module 800 is preferably a liquid crystal panel; however, it may be another display panel that requires a backlight.

The support frame 500 further includes spacers 530 and 540 respectively interposed between the flange 510 and the second surface 622 and the flange 510 and the optical film group 300 for positioning the light guide plate 200 and the optical film group 300, and The displacement of the light shielding module 600 is further limited. The pad 530 located above the light guide plate 200 is partially disposed on the light guide plate 200 via the light shielding module 600, and the other portion is indirectly disposed on the first reflective substrate 640 via the light shielding module 600. In a preferred embodiment, the spacers should also be strip-shaped and extend along the sides of the light guide 200. Pad The light transmittance of 530 may be lower than the light transmittance of the light-shielding substrate 620 to further enhance the light shielding effect. However, in different embodiments, the light transmittance of the spacer 530 may be lower than that of the light shielding substrate 620, for example, a material having better elasticity but higher light transmittance is used to improve the fixing effect. The material of the spacer 530 is preferably compressible, such as rubber or conductive foam, to produce a suitable pressing effect, and to reduce the problems caused by assembly tolerances.

While the foregoing description of the preferred embodiments of the invention, the embodiments of the invention The spirit and scope of the principles of the invention. Modifications of many forms, structures, arrangements, ratios, materials, components and components can be made by those skilled in the art to which the invention pertains. Therefore, the embodiments disclosed herein are to be considered as illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and the legal equivalents thereof are not limited to the foregoing description.

10‧‧‧Backlight module

20‧‧‧Light guide

22‧‧‧Into the light end

24‧‧‧Glossy

30‧‧‧Optical diaphragm group

40‧‧‧Light source

41‧‧‧reflector

50‧‧‧Support frame

53, 54‧‧‧ blocks

70‧‧‧back shell

80‧‧‧ panel module

90‧‧‧Liquid crystal display device

91‧‧‧Light

92‧‧‧Light

100‧‧‧Backlight module

200‧‧‧Light guide plate

220‧‧‧Into the light end

240‧‧‧Glossy

300‧‧‧Optical diaphragm group

400‧‧‧Light source module

410‧‧‧reflector

500‧‧‧Support frame

510‧‧‧Flange

530, 540‧‧‧ blocks

600‧‧‧Lighting module

620‧‧‧Lighting substrate

621‧‧‧ first side

622‧‧‧ second side

640‧‧‧First reflective substrate

641‧‧‧reflecting surface

644‧‧‧Second reflective substrate

660‧‧ ‧ glue layer

700‧‧‧back shell

800‧‧‧ Panel Module

900‧‧‧ display device

901‧‧‧Light

903‧‧‧Light

905‧‧‧Light

990‧‧‧ accommodating space

G‧‧‧ gap

Θ‧‧‧incident angle

1 is a schematic view of a conventional backlight module; FIG. 2A is a schematic view of a preferred embodiment of the present invention; FIG. 2B is a schematic view of a different embodiment of the reflective substrate without covering the light source module; FIG. 3 is a schematic diagram of a light travel path in a preferred embodiment of the present invention; FIG. 4 is a schematic diagram of a light travel path in different embodiments of the present invention.

100‧‧‧Backlight module

200‧‧‧Light guide plate

220‧‧‧Into the light end

240‧‧‧Glossy

300‧‧‧Optical diaphragm group

400‧‧‧Light source module

410‧‧‧reflector

500‧‧‧Support frame

510‧‧‧Flange

530, 540‧‧‧ blocks

600‧‧‧Lighting module

620‧‧‧Lighting substrate

621‧‧‧ first side

622‧‧‧ second side

640‧‧‧Reflecting substrate

641‧‧‧reflecting surface

660‧‧ ‧ glue layer

700‧‧‧back shell

800‧‧‧ Panel Module

900‧‧‧ display device

990‧‧‧ accommodating space

G‧‧‧ gap

Claims (8)

A backlight module includes: a reflective sheet; a light guide plate disposed on the reflective sheet, having an adjacent light incident surface and a light exiting surface; a light source module having a circuit board and a light source, the light source setting Corresponding to the light incident surface on the circuit board, and having a gap between the light source and the light incident surface; a light shielding module comprising: a light shielding substrate disposed on the light source and extending from the circuit board to the light output And covering the gap; a first reflective substrate disposed on the bottom surface of the light-shielding substrate and located on the gap; a glue layer disposed in parallel with the first reflective substrate on the bottom surface of the light-shielding substrate, the glue The layer is attached to the light-emitting surface and does not overlap with the first reflective substrate; and a spacer disposed on the light-shielding module. The backlight module of claim 1, wherein the area of the first reflective layer is not less than the area of the gap. The backlight module of claim 1, wherein the first reflective substrate extends over the light source. The backlight module of claim 1, wherein the adhesive layer is adjacent to the first reflective substrate, and the thickness of the adhesive layer is not greater than or less than the thickness of the first reflective substrate. The backlight module of claim 1, wherein the shading module comprises a second counter The second reflective substrate is disposed under the light source and extends from the circuit board to cover the gap to face the first reflective substrate and is in contact with the reflective sheet. A display device, comprising: the backlight module of any one of claims 1 to 5; a panel module disposed on the light guide plate; a support frame surrounding the panel module, including a flange at the shading The module is opposite to the other side of the bottom surface of the light-shielding substrate, wherein the flange extends above the optical film set; and a rear case forms a receiving space with the support frame to accommodate the backlight module And the panel module. The display device of claim 6, wherein the spacer is interposed between the flange and the other surface of the bottom surface of the light shielding substrate. The display device of claim 7, wherein a portion of the spacer is disposed on the light guide plate indirectly via the light shielding module, and another portion is disposed on the first reflective substrate indirectly via the light shielding module.