CN103234160B - Backlight module with shading module and display device using the same - Google Patents

Abstract

The invention provides a backlight module and a display device using the same. The backlight module comprises a light guide plate, a light source module and a shading module. The light guide plate is provided with an adjacent light incident surface and an adjacent light emergent surface. The light source module is arranged corresponding to the light incident surface, and a gap is formed between the light source module and the light incident surface. The shading module comprises a shading substrate and a first reflection substrate, wherein the shading substrate is arranged on the light source module and extends to cover the light-emitting surface, and the first reflection substrate is arranged on the bottom surface of the shading substrate and is positioned on the gap. The display device comprises the backlight module, the panel module, the supporting frame and the rear shell.

Description

Backlight module with shading module and display device using the backlight module

【Technical field】

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

【Background technique】

In recent years, liquid crystal displays (Liquid Crystal Displays) have become the mainstream of various display devices. For example, household televisions, personal computers, laptop computers, monitors, mobile phones, and digital cameras are all products that use liquid crystal display devices in large quantities. The backlight module (Backlight Module) applied to the liquid crystal display device is used to supply a light source with sufficient brightness and uniform distribution, so that the liquid crystal display device can display images normally.

The conventional liquid crystal display device 90 shown in FIG. 1 includes a panel module 80 , a backlight module 10 , a supporting frame 50 and a rear case 70 . Wherein, the backlight module 10 includes a light guide plate 20, an optical film set 30, a light source 40, and a reflector 41, which adopts a side-light type backlight module, that is, adopts the light-incoming mode of the light-incident end 22 on the side of the light guide plate 20, and 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 will not generate totally reflected light on the light exit surface 24 because the incident angle θ is smaller than the total reflection angle, so the light guide plate 20 will be close to the light incident end. 22, and when the pads 53, 54 that position the light guide plate 20 or the optical film set 30 are displaced, the light 91 will pass from the gap between the light guide plate 20 and the pad 53 or between the optical film set and the pad 54 (not shown) (shown in the figure) leaks out, or directly refracts out through the optical film group 30, thereby generating a light leakage phenomenon. On the other hand, since there is a gap G between the light source 40 and the light incident end 22 , the light 92 may also leak through the gap. There is room for improvement in the above backlight module and liquid crystal display device.

【Content of invention】

The main purpose 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 including the same, which have a smaller frame width.

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

The first reflective substrate further extends to cover the light source module. The light-shielding module includes an adhesive layer disposed on the 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 also includes a second reflective base material disposed under the light source module, located at the projection position of the first reflective base material, and extending below the gap.

The display device includes the aforementioned backlight module, panel module, support frame and rear shell. The panel module is arranged on the light guide plate. The supporting frame surrounds the panel module and includes a flange located on a second side of the shading module opposite to the first side. The back shell and the supporting frame jointly form an accommodating space for accommodating the backlight module and the panel module. The supporting frame further includes a spacer interposed between the flange and the second surface, a part of the spacer is indirectly arranged on the light guide plate through the light shielding module, and another part is indirectly arranged on the first reflective substrate through the light shielding module. The support frame further includes spacers interposed between the flange and the optical film group.

【Description of drawings】

FIG. 1 is a schematic diagram of an existing backlight module;

Figure 2A is a schematic diagram of a preferred embodiment of the present invention;

2B is a schematic diagram of different embodiments in which the reflective substrate does not cover the light source module in the present invention;

Fig. 2C is a schematic diagram of different embodiments in which the reflective substrate partly covers the light source module in the present invention;

FIG. 3 is a schematic diagram of light travel paths in a preferred embodiment of the present invention; FIG. 4 is a schematic diagram of light travel paths in different embodiments of the present invention.

[Description of main component symbols]

10 backlight module

20 light guide plate

22 light input end

24 light emitting surface

30 optical diaphragm group

40 light sources

41 reflector

50 support frame

53, 54 pads

70 back shell

80 panel modules

90 liquid crystal display device

91 rays

92 rays

100 backlight modules

200 light guide plate

220 incident light end

240 light emitting surface

300 optical film set

400 light source modules

410 reflector

500 support frame

510 flange

530, 540 pads

127756

600 shading module

620 shading substrate

621 first side

622 second side

640 first reflective substrate

641 reflective surface

644 second reflective substrate

660 adhesive layer

700 back shell

800 panel modules

900 display device

901 rays

903 rays

905 rays

990 accommodation space

G gap

θ incident angle

【detailed description】

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

In the preferred embodiment shown in FIG. 2A , the backlight module 100 of the present invention is used together with the panel module 800 , the support frame 500 and the rear case 700 to form a display device 900 . The rear case 700 and the supporting 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 a side-light light incident 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 an adjacent light incident surface 220 and a light exit surface 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 therebetween. The light source module 400 may include a light source such as a light emitting diode (Light Emitting Diodes, LED) or a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp; CCFL). The backlight module 100 further includes an optical film set 300 disposed on the light emitting surface 240 . In a preferred embodiment, the optical film group 300 is adjacent to the light-shielding module 600 to form a state of being continuously disposed on the light guide plate 200 . In other words, the optical film set 300 is juxtaposed with the light-shielding module 600 and is continuously disposed on the light-emitting surface 240 .

In a preferred embodiment shown in FIG. 2A , the light-shielding module 600 includes a light-shielding substrate 620 and a first reflective substrate 640, wherein the light-shielding substrate 620 is arranged on the light source module 400 and extends to cover the light-emitting surface 240, and the first reflective substrate 640 is disposed on the bottom surface of the light-shielding substrate 620 and located on the gap G. As shown in FIG. 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 . Wherein, the light-shielding module 600 and the first reflective substrate 640 are preferably arranged in a strip shape and extend along the side of the light guide plate 200 . The area of the first reflective substrate 640 is not smaller than the (projected) area of the gap G.

In a preferred embodiment, the light-shielding module 600 includes an adhesive layer 660 disposed on the bottom surface of the light-shielding substrate 620 , adjacent to the first reflective substrate 640 , and located between the light-emitting surface 240 and the light-shielding substrate 620 . The light shielding module 600 also includes a second reflective substrate 644 disposed under the light source module 400 , located at the projection position of the first reflective substrate 640 , and extending below the gap G. As shown in FIG. Viewed from different angles, the area of the first reflective substrate 640 is smaller than that of the first surface 621, and the portion of the first surface 621 that does not overlap with the first reflective substrate 640 has an adhesive layer 660, which is attached to the light-emitting surface 240. The first reflective The base material 640 further extends to cover the gap G between the light source module 400 and the light incident end 220 . Among them, the shading module 600 preferably includes an adhesive layer 660 and the first reflective substrate 640 arranged side by side on the first surface 621 , the adhesive layer 660 is connected to the first surface 621 and does not overlap with the first reflective substrate 640 on the light exit surface 240 . 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 no greater than or less than the thickness of the first reflective substrate 640 , so that the light-emitting surface 240 is closer to the first surface 621 than the reflective surface 641 of the first reflective substrate 640 .

As shown in FIG. 3 , since the light-shielding module 600 is provided on the part 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 originally because the incident angle is smaller than the total reflection angle will be transmitted by the light-shielding substrate. 620 is directly shielded to prevent it from being emitted from the end of the light guide plate 200 close to the light incident end 220, and when the pads 530, 540 of the light guide plate 200 or the optical film group 300 are displaced, the light 910 is emitted from the light guide plate 200 and the pad 530 Occasionally, the gap (not shown) between the optical film set 300 and the spacer 530 leaks out, resulting in 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 903 is not only shielded by the light-shielding substrate 620, but also reflected by the first reflective substrate 640, so It can be prevented from leaking through the gap G between the light source module 400 and the light incident end 220 . In other words, the disposition of the first reflective substrate 640 not only solves the problem of light leakage in the gap G between the light source module 400 and the light incident end 220 , but also improves the utilization rate 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 possibility of light leakage and increasing structural stability. However, in different embodiments, due to considerations such as process convenience or material cost saving, the first reflective substrate 640 may be selected to cover the light source module 400 as shown in FIG. 2B or only partially cover the light source module 400 as shown in FIG. A reflective substrate 640 extending at least longer than the width of the gap G can cover the gap G to reduce light leakage. The first reflective substrate 640 is preferably supported by the light source module 400 . Furthermore, one end of the first reflective substrate 640 of the shading module 600 is preferably supported by the light source module 400 , and the other end is supported by the light guide plate 200 . Preferably, double-sided adhesive tape or other connection materials can be provided between the first reflective substrate 640 and the light source module 400; connection; or the first reflective substrate 640 is not in direct contact with the light source module 400, but there is a gap therebetween to facilitate heat dissipation.

In the embodiment shown in FIG. 4 , the shading module 600 also includes a second reflective substrate 640 , which is juxtaposed with the reflective sheet 410 and is continuously disposed on the rear case 700 and covers the gap G between the light source module 400 and the light incident end 220 , and It is opposite to the first reflective substrate 640 with a gap G therebetween. Thereby, the leakage of the light 905 from the gap G between the light source module 400 facing the first reflective substrate 640 and the light incident end 220 can be further prevented, and the utilization rate of the light can be improved.

In the preferred embodiment shown in FIG. 2A , the supporting frame 500 surrounds the panel module 800 , including the flange 510 located on the second surface 622 of the light-shielding module 600 opposite to the first surface 621 . Viewed from different angles, the flange 510 extends toward the center of the panel module 800 . The panel module 800 is preferably a liquid crystal panel; however, it can also be other display panels requiring a backlight.

The supporting frame 500 further includes spacers 530 and 540 respectively sandwiched between the flange 510 and the second surface 622 and between the flange 510 and the optical film set 300 for positioning the light guide plate 200 and the optical film set 300, and can The displacement of the shading module 600 is further restricted. Wherein, a part of the pad 530 located above the light guide plate 200 is indirectly disposed on the light guide plate 200 through the light shielding module 600 , and another part is indirectly disposed on the first reflective substrate 640 through the light shielding module 600 . In a preferred embodiment, the pads can also be arranged in a strip shape and extend along the side of the light guide plate 200 . The light penetration of the spacer 530 may be lower than that of the light-shielding substrate 620 to further improve the light-shielding effect. However, in different embodiments, the light penetration of the spacer 530 may be lower than that of the light-shielding substrate 620 , for example, a material with better elasticity but higher light penetration is used to improve the fixing effect. The material of the spacer 530 is preferably compressible, such as rubber or conductive foam, so as to produce a proper compression effect and reduce problems caused by assembly tolerances.

Although the foregoing description and drawings have disclosed preferred embodiments of the present invention, it must be understood that various additions, modifications and substitutions may be applied to the preferred embodiments of the present invention without departing from the scope of the appended patent application spirit and scope of the principles of the invention. Those of ordinary skill in the art to which the invention pertains will appreciate that the invention can be employed with many modifications in form, structure, arrangement, proportion, material, element and assembly. Therefore, the embodiments disclosed herein should be regarded as illustrating the present invention rather than limiting the present invention. The scope of the present invention should be defined by the claims of the appended claims and cover their legal equivalents, not limited by the foregoing description.

Claims (10)

1. A backlight module, comprising: A light guide plate having a light incident surface and a light exit surface adjacent thereto; A light source module, having a light source, the light source is arranged corresponding to the light incident surface, and there is a gap between the light source and the light incident surface; A shading module, comprising: a light-shielding substrate, arranged on the light source module and extending to the light-emitting surface, and covering the gap; a first reflective substrate, disposed on the light-shielding substrate, and located on the gap; an adhesive layer, arranged side by side with the first reflective base material on the bottom surface of the light-shielding substrate, the adhesive layer is attached to the light-emitting surface and does not overlap with the first reflective base material; and A spacer, the spacer is arranged on the light-shielding module, a part of the spacer is indirectly arranged on the light guide plate through the light-shielding module, and the other part is indirectly arranged on the first reflective substrate through the light-shielding module, The spacer is arranged in a strip shape and extends along the side of the light guide plate, and the light penetration of the spacer is lower than that of the light-shielding substrate. 2. The backlight module according to claim 1, wherein the area of the first reflective substrate is not smaller than the area of the gap. 3. The backlight module according to claim 1, wherein the first reflective substrate further extends to cover the light source module. 4. The backlight module according to claim 1, wherein the adhesive layer is adjacent to the first reflective substrate, and the thickness of the adhesive layer is not greater than the thickness of the first reflective substrate. 5. The backlight module according to claim 1, wherein the shading module further comprises a second reflective substrate, the second reflective substrate is disposed under the light source module, and is located on the side of the first reflective substrate projected position and extends below the gap. 6. The backlight module according to claim 1, characterized in that it comprises an optical film group, the optical film group is arranged on the light-emitting surface, and is adjacent to the light-shielding module, forming a continuous arrangement on the light guide plate appearance. 7. A display device comprising The backlight module according to any one of claims 1 to 5; a panel module arranged on the light guide plate; a support frame surrounding the panel module, including a flange on a second side of the shading module opposite to a first side; and A rear case forms an accommodating space together with the support frame to accommodate the backlight module. 8 . The display device according to claim 7 , wherein the supporting frame further comprises the spacer interposed between the flange and the second surface. 9. A display device comprising The backlight module according to claim 6; a panel module arranged on the light guide plate; a support frame surrounding the panel module, including a flange on a second side of the shading module opposite to a first side; and A rear case forms an accommodating space together with the support frame to accommodate the backlight module and the optical film group. 10 . The display device according to claim 9 , wherein the supporting frame further comprises a spacer interposed between the flange and the optical film set. 11 .