TW201333599A - Backlight module - Google Patents

Abstract

A backlight module including a light guide plate, a light source device, a cover, and a plurality of elastic elements is provided. The light source module is disposed at a side of the light guide plate and includes a plurality of light sources. The cover covers the light sources. The elastic elements are connected to the cover and respectively push the light sources toward the light guide plate, such that the light sources contact the light guide plate. The elastic elements are separated from one another.

Description

Backlight module

The invention relates to a light source module, and in particular to a backlight module.

In recent years, as the technology industry has become more developed, the use of digital tools such as optical scanners, mobile phones, digital cameras, and notebooks has become more common. And develop in a convenient, versatile and aesthetically pleasing design to provide users with more choices. As users' demand for digital products increases, the backlight modules used in these products have also become the focus of design improvements.

In the case of a side-lit backlight module, for example, a light bar composed of a light emitting diode (LED) light source and a substrate is used as a light source device, and the light source device is disposed on the light guide plate. The side of the light source emits light from the side of the light guide plate into the light guide plate. In general, the light-emitting diode light source must be in positive contact with the light guide plate, and the light emitted by the light-emitting diode can completely enter the light guide plate, so that the backlight module has good light-emitting efficiency. However, manufacturing and assembly tolerances may cause gaps between the light-emitting diode source and the light guide plate, and when the light guide plate is thermally expanded and contracted due to temperature changes, the light-emitting diode light source may not be reliably contacted. Light board, these conditions will affect the light output efficiency of the backlight module.

The Republic of China Patent No. TWM373500 discloses a holding device in which the upper cover is formed in a metal stamping manner and is L-shaped. The Republic of China Patent No. TWM362364 discloses a lampshade having an inner wall surface of the wall body having a fixing member which can be a plate-like body and protrudes from the inner wall surface. The Republic of China Public Patent No. TW201040631 discloses a side-entry backlight module in which a lamp cover is fixed to a plastic frame by the engagement of the engaging member. The Republic of China Patent No. TWI295398 discloses a backlight module having a plurality of positioning projecting arms and a plurality of elastic members. The positioning projecting arms and the elastic members constitute a plurality of light source accommodating regions for arranging a plurality of light emitting elements. . U.S. Patent No. US20070047265 discloses a light source unit having a lamp cover having a projection that protrudes toward the light source.

The invention provides a backlight module with better light extraction efficiency.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein.

One embodiment of the present invention provides a backlight module including a light guide plate, a light source device, a cover body, and a plurality of elastic members. The light source device is disposed at a side of the light guide plate and includes a plurality of light sources. The cover masks these light sources. The elastic members are coupled to the cover and respectively push the light sources toward the light guide plate to bring the light sources into contact with the light guide plates. These elastic members are separated from each other.

Based on the above, at least one of the following advantages is obtained in the above embodiments of the present invention, the elastic members connected to the cover body push the light sources against the light guide plate by the elastic force thereof to avoid a gap between the light source and the light guide plate. The backlight module has good light extraction efficiency. Further, since the elastic members are separated from each other, each elastic member is elastically deformed independently when it is pushed against the corresponding light source, so as to ensure that all the light sources can be surely pressed by the elastic member to contact the light guide plate.

The above described features and advantages of the invention will be apparent from the following description.

The foregoing and other objects, features, and advantages of the invention will be apparent from the Detailed Description The directional terms mentioned in the following embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only directions referring to the additional schema. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

1 is a side view of a backlight module in accordance with an embodiment of the present invention. 2 is a top plan view of the backlight module of FIG. 1 along a viewing angle V. 3 is a perspective view of the cover and the elastic member of FIG. 1. To make the drawings clearer, the substrate 122 of FIG. 1 is not depicted in FIG. Referring to FIG. 1 to FIG. 3 , the backlight module 100 of the present embodiment includes a light guide plate 110 , a light source device 120 , a cover body 130 , and a plurality of elastic members 140 . The light source device 120 is disposed on the side of the light guide plate 110 and includes a plurality of light sources 124. The light source 124 is, for example, a light emitting diode (LED) light source. The cover 130 is used to cover the light sources 124 and reflect the light emitted by the light sources 124. The elastic members 140 are connected to the cover 130 and respectively push the light sources 124 toward the light guide plate 110 to bring the light sources 124 into contact with the light guide plate 110. These elastic members 140 are separated from each other.

In the above configuration, the elastic members 140 connected to the cover 130 push the light sources 124 toward the light guide plate 110 by the elastic force thereof to avoid a gap between the light source 124 and the light guide plate 110, so that the backlight module 100 is provided. Has a good light output efficiency. Further, since the elastic members 140 are separated from each other, each elastic member 140 is elastically deformed independently when it is pushed against the corresponding light source 124, so as to ensure that all the light sources 124 can be reliably contacted by the elastic member 140. Light guide plate 110.

The backlight module 100 of the present embodiment is applied, for example, to a liquid crystal display (LCD) for providing light required for a liquid crystal display device to display a screen. In other embodiments, the backlight module 100 can be applied to other kinds of devices, which is not limited by the present invention.

In the present embodiment, the material of each of the elastic members 140 and the cover body 130 is, for example, metal or injection molded material, and the elastic members 140 are integrally formed with the cover body 130. The manner in which the elastic members 140 are formed on the cover 130 is, for example, a stamping process. In detail, the cover body 130 includes a first plate body 132 and a plurality of folding walls 134. The folding wall 134 is connected to the first plate body 132 and spaced apart. The folding wall 134 and the first plate body 132 are L-shaped, and the elastic Pieces 140 are attached to the fold walls 134, respectively. In this embodiment, each of the elastic members 140 has a half moon shape and is connected to the corresponding folding wall 134 and extends to the adjacent another folding wall 134. As shown in FIG. 2, the width W of each of the elastic members 140 is smaller than the spacing D between the adjacent two folded walls 134, and the spacing D between the two folded walls 134 provides a space for elastic deformation of the elastic members 140. The elastic member 140 may have other suitable shapes in other embodiments, such as an obtuse triangle, an acute triangle, or a semi-elliptical shape, in addition to the half moon shape, which is not limited by the present invention.

As shown in FIG. 1, in the present embodiment, each of the elastic members 140 and the first plate 132 has a gap G1. In other words, the elastic member 140 does not contact the first plate body 132, and the friction between the elastic member 140 and the first plate body 132 can be prevented from hindering the elastic deformation of the elastic member 140.

The light source device 120 of the present embodiment includes a substrate 122. The light sources 124 are disposed on the substrate 122 to form a light-emitting diode light strip. There is a gap between the substrate 122 and the cover 130. The elastic members 140 and the light sources 124 are located between the substrate 122 and the cover 130. In addition, a reflective layer 130b (shown in FIG. 3) may be disposed on the surface 130a of the cover 130 facing the light sources 124 for reflecting the light emitted by the light source 124 to the light guide plate 110.

4 is a side view of a cover body and an elastic member according to another embodiment of the present invention. Referring to FIG. 4 , the cover body 230 of the present embodiment further includes a second plate body 236 in addition to the first plate body 232 and the folding wall 234 of the first plate body 132 and the folding wall 134 of FIG. 1 . There is a gap between the first plate body 232 and the second plate body 236. The folding wall 234 is connected between the first plate body 232 and the second plate body 236. The folding wall 234, the first plate body 232 and the second plate body 236 are U. The elastic member 240 is connected to the folding wall 234. The functions of the cover 230 and the elastic member 240 are similar to those of the cover 130 and the elastic member 140 of FIG. 1. When the cover 230 is used to cover the light source, the elastic member 240 can push the light source toward the light guide plate, so that the light source is indeed Ground contact with the light guide plate. In the present embodiment, the elastic member 240 and the first plate 232 have a gap G2 therebetween, and the elastic member 240 and the second plate 236 have a gap G3 therebetween. In other words, the elastic member 240 does not contact the first plate body 232 and the second plate body 236, and the friction between the elastic member 240 and the first plate body 232 and the friction between the elastic member 240 and the second plate body 236 can be avoided. The elastic deformation of the elastic member 240 is hindered.

In summary, in the above embodiments of the present invention, at least one of the following advantages is obtained. The elastic members connected to the cover body push the light sources against the light guide plate by elastic force thereof to avoid the cause between the light source and the light guide plate. The thermal expansion and contraction of the light guide plate or the manufacturing and assembly tolerances and the like have a gap, so that the backlight module has good light extraction efficiency. Further, since the elastic members are separated from each other, each elastic member is elastically deformed independently when it is pushed against the corresponding light source, so as to ensure that all the light sources can be surely pressed by the elastic member to contact the light guide plate.

However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made according to the claims and the description of the present invention are still the present invention. Within the scope of the patent. In addition, any of the embodiments or the claims of the present invention are not required to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the claims of the invention. In addition, the terms "first", "second" and the like mentioned in the specification or the claims are only used to name the components or distinguish different embodiments or ranges, and are not intended to limit the upper or lower limit of the number of components. .

100. . . Backlight module

110. . . Light guide

120. . . Light source device

122. . . Substrate

124. . . light source

130, 230. . . Cover

130a. . . surface

130b. . . Reflective layer

132, 232. . . First plate

134, 234. . . Folding wall

140, 240. . . Elastic part

236. . . Second plate

D. . . spacing

G1, G2, G3. . . gap

V. . . Perspective

W. . . width

1 is a side view of a backlight module in accordance with an embodiment of the present invention.

2 is a top plan view of the backlight module of FIG. 1 along a viewing angle V.

3 is a perspective view of the cover and the elastic member of FIG. 1.

4 is a side view of a cover body and an elastic member according to another embodiment of the present invention.

110. . . Light guide

120. . . Light source device

124. . . light source

130. . . Cover

132. . . First plate

134. . . Folding wall

140. . . Elastic part

D. . . spacing

W. . . width

Claims (14)

A backlight module includes: a light guide plate; a light source device disposed on a side of the light guide plate and including a plurality of light sources; a cover body covering the light sources; and a plurality of elastic members connected to the cover body and The light sources are respectively pushed toward the light guide plate to make the light sources contact the light guide plate, wherein the elastic members are separated from each other. The backlight module of claim 1, wherein the elastic members are integrally formed with the cover. The backlight module of claim 1, wherein the cover body comprises: a first plate body; and a plurality of folding walls connected to the first plate body and spaced apart, wherein the elastic members are respectively connected In these folding walls. The backlight module of claim 3, wherein each of the elastic members is connected to the corresponding folding wall and extends to the adjacent one of the folding walls. The backlight module of claim 3, wherein a width of each of the elastic members is smaller than a spacing between the adjacent two of the folded walls. The backlight module of claim 3, wherein each of the elastic members has a gap with the first plate. The backlight module of claim 3, wherein each of the folding walls and the first plate are L-shaped. The backlight module of claim 3, wherein the cover further comprises a second plate body, wherein the first plate body and the second plate body have a spacing, and the plurality of folding walls are connected to the first Between the plate body and the second plate body. The backlight module of claim 8, wherein each of the folding walls, the first plate body and the second plate body are U-shaped. The backlight module of claim 8, wherein each of the elastic members and the second plate has a gap therebetween. The backlight module of claim 1, wherein each of the elastic members has a half moon shape, an obtuse triangle shape, an acute angle triangle shape or a semi-elliptical shape. The backlight module of claim 1, wherein the light source device comprises a substrate, and the light sources are disposed on the substrate. The backlight module of claim 12, wherein the substrate and the cover have a spacing between the substrate and the cover. The backlight module of claim 1, wherein the cover has a surface facing the light sources and having a reflective layer.