TWI499844B - Backlight module and assembly method thereof - Google Patents

Description

Backlight module and assembly method thereof

The invention relates to a method for assembling a backlight module and a backlight module.

Since consumers have higher and higher requirements for the appearance of flat-panel displays (such as liquid crystal screens), the backlight modules of current displays tend to be narrow-frame designs. As a result, the space inside the frame of the backlight module is reduced, and the structure of the positioning light guide plate is not easy to design.

The light guide plate of the conventional backlight module can be positioned in the frame in the following manners. For example, the positioning column located in the frame can be positioned through the edge of the light guide plate, but due to the limited space inside the frame, the positioning column may be too close to the visible area of the display, so that the quality of the picture is lowered. In addition, the positioning may be performed by the fixing structure located in the frame adjacent to the edge of the light guide plate. However, when the light guide plate emits light, it will heat up and expand, so that a gap needs to be provided between the fixing structure and the light guide plate. As a result, the light guide plate is not fixed.

In addition, the compressed material may be attached to the inner surface of the frame, and then the light guide plate may be placed in the frame to position the side of the light guide plate against the compressed material. Of course However, when the light guide plate is placed, the bottom surface of the light guide plate may be pressed against the top surface of the compressed material, so that the compressed material may be detached from the frame or broken and the effect of positioning the light guide plate may be lost.

One aspect of the present invention is a backlight module.

According to an embodiment of the invention, a backlight module includes a housing, a light guide plate, a positioning member, and a buffer member. The housing has a bottom plate and at least one side wall adjacent the bottom plate. The bottom plate and the side wall together form an accommodation space. The light guide plate is located in the accommodating space. The light guide plate has at least one side surface and a bottom surface adjacent to the bottom surface. The positioning member includes a limiting plate, a supporting plate and a connecting plate. The limiting plate abuts against the side of the light guide plate. The support plate supports the bottom surface of the light guide plate. The connecting plate abuts the limiting plate and the supporting plate, and the connecting plate at least partially abuts against the bottom plate. The connecting plate and the limiting plate are obtuse. The buffering member is located on the surface of the limiting plate and the connecting plate facing away from the light guiding plate, so that the buffering member is sandwiched between the housing and the positioning member.

In one or more embodiments of the present invention, the connecting plate includes an inclined portion and a connecting portion. The inclined portion abuts the limiting plate, and the inclined portion and the limiting plate are obtuse. The connecting portion abuts the inclined portion and the support plate.

In one or more embodiments of the present invention, the connecting portion and the supporting plate are at an acute angle such that the supporting plate extends in the direction of the limiting plate.

In one or more embodiments of the invention, the orthographic projection of the connecting portion on the bottom plate at least partially overlaps the orthographic projection of the support plate on the bottom plate.

In one or more embodiments of the present invention, the connecting portion and the supporting plate are at an obtuse angle such that the supporting plate extends away from the limiting plate.

In one or more embodiments of the present invention, the orthographic projection of the inclined portion on the bottom plate at least partially overlaps with the orthographic projection of the light guide plate on the bottom plate.

In one or more embodiments of the present invention, the abutting portion of the inclined portion and the connecting portion abuts against the bottom plate.

In one or more embodiments of the present invention, the connecting portion includes a first sub-section and a second sub-portion. The first portion abuts the inclined portion. The second portion abuts the first portion and the support plate.

In one or more embodiments of the present invention, the first portion is parallel to the support plate.

In one or more embodiments of the present invention, the second sub-portion is substantially perpendicular to the first sub-portion.

In one or more embodiments of the present invention, the orthographic projection of the first sub-portion on the bottom plate at least partially overlaps the orthographic projection of the support plate on the bottom plate.

In one or more embodiments of the present invention, the entire cross-sectional shape of the limiting plate and the inclined portion is V-shaped, and the cross-sectional shape of the cushioning member is also V-shaped.

In one or more embodiments of the present invention, the cushioning member is attached to the surface of the position plate and the inclined portion facing away from the light guide plate.

In one or more embodiments of the invention, the support plate is substantially parallel to the bottom plate.

In one or more embodiments of the present invention, the limiting plate has opposite side edges. One of the two side edges of the limiting plate abuts the connecting plate, and the shortest distance between the two side edges is greater than or equal to half the thickness of the light guide plate.

In one or more embodiments of the present invention, the material of the buffer member Contains rubber, silicone, foam or a combination of the above.

In the above embodiment of the present invention, since the connecting plate of the positioning member abuts the limiting plate and the supporting plate, and the connecting plate and the limiting plate have an obtuse angle, when the light guiding plate is located on the positioning member, the limiting plate can abut the light guiding plate. On the side, the support plate can support the bottom surface of the light guide plate, and the connecting plate at least partially abuts against the bottom plate. In this way, the positioning member can simultaneously have the function of carrying and positioning the light guide plate. In addition, the cushioning member interposed between the housing and the positioning member has elasticity, which not only prevents the positioning member from shaking in the accommodating space of the housing, but also reduces the external force transmitted from the housing to the positioning member and the light guide plate, thereby avoiding The light guide plate is broken.

Another technical aspect of the present invention is a method of assembling a backlight module.

According to an embodiment of the present invention, a method for assembling a backlight module includes the following steps: attaching a buffer member to an outer side of the positioning member, so that the buffer member is located on the connecting plate of the limiting plate of the positioning member and the adjacent limiting plate. The light guide plate is positioned on the inner side of the positioning member relative to the cushioning member. The buffer member, the positioning member and the light guide plate are installed in the housing such that the buffer member is sandwiched between the housing and the positioning member.

In one or more embodiments of the present invention, the positioning member includes a limiting plate, a supporting plate and a connecting plate adjacent to the limiting plate and the supporting plate. Positioning the light guide plate on the inner side of the positioning member relative to the buffer member includes: abutting the side of the light guide plate against the limiting plate, and supporting the bottom surface of the light guide plate by using the supporting plate.

In one or more embodiments of the present invention, the connecting plate includes an inclined portion and a connecting portion. The inclined portion abuts the limiting plate, and the inclined portion and the limiting plate are obtuse. The connecting portion abuts the inclined portion and the support plate. Attach the cushion to the positioning The outer side of the piece includes a bending cushion member such that a part of the cushioning member is attached to the limiting plate, and another portion of the cushioning member is attached to the inclined portion.

In one or more embodiments of the present invention, the attaching the cushioning member, the positioning member, and the light guide plate to the housing includes: abutting the abutting portion of the connecting portion and the inclined portion to the housing.

In the above embodiment of the present invention, when the backlight module is assembled, the buffer member may be attached to the outer side of the positioning member before the buffer member, the positioning member and the light guide plate are installed in the housing. Since the connecting plate and the limiting plate are obtusely angled, the cushioning member attached to the positioning member may also have an obtuse angle. In this way, the cushioning member can be easily installed in the casing along with the positioning member, and it is not easy to fall off or break due to the friction casing during assembly.

100‧‧‧Backlight module

100a‧‧‧Backlight module

100b‧‧‧Backlight module

110‧‧‧shell

112‧‧‧floor

114‧‧‧ side wall

116‧‧‧ accommodating space

120‧‧‧Light guide

122‧‧‧ bottom

124‧‧‧ side

130‧‧‧ Positioning parts

132‧‧‧Limited board

133‧‧‧ surface

134‧‧‧support plate

135‧‧‧ side edge

136‧‧‧Connecting plate

137‧‧‧ side edge

142‧‧‧ inclined section

143‧‧‧ surface

144‧‧‧Connecting Department

146‧‧‧ First Department

148‧‧‧Second Department

150‧‧‧ cushioning parts

162‧‧‧Optical diaphragm

164‧‧‧reflector

2-2‧‧‧ segments

D‧‧‧thickness

D1‧‧ Direction

D2‧‧ Direction

H‧‧‧Short distance

S1‧‧‧ steps

S2‧‧‧ steps

S3‧‧‧ steps

Θ1‧‧‧ obtuse angle

Θ2‧‧‧ acute angle

Θ3‧‧‧ obtuse angle

Θ4‧‧‧right angle

FIG. 1 is a top plan view of a backlight module according to an embodiment of the invention.

2 is a cross-sectional view of the backlight module of FIG. 1 along line 2-2.

Fig. 3 is a perspective view showing the combination of the positioning member and the cushioning member of Fig. 2.

4 is a cross-sectional view of a backlight module according to an embodiment of the present invention, the cross-sectional position of which is the same as that of FIG. 2 .

Fig. 5 is a perspective view showing the combination of the positioning member and the cushioning member of Fig. 4.

6 is a cross-sectional view of a backlight module according to an embodiment of the present invention, the cross-sectional position of which is the same as that of FIG. 2 .

Fig. 7 is a perspective view showing the combination of the positioning member and the cushioning member of Fig. 6.

FIG. 8 is a flow chart showing a method of assembling a backlight module according to an embodiment of the present invention.

The embodiments of the present invention are disclosed in the following drawings, and the details of However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

FIG. 1 is a top plan view of a backlight module 100 according to an embodiment of the invention. 2 is a cross-sectional view of the backlight module 100 of FIG. 1 along line 2-2. Referring to FIGS. 1 and 2 , the backlight module 100 includes a housing 110 , a light guide plate 120 , a positioning member 130 , and a buffer member 150 . The housing 110 has a bottom plate 112 and at least one side wall 114 adjacent to the bottom plate 112, and the bottom plate 112 and the side wall 114 together form an accommodation space 116. The light guide plate 120 is located in the accommodating space 116 and supported by the positioning member 130. In the present embodiment, the light guide plate 120 may be attached to the positioning member 130 by an adhesive (for example, a double-sided tape), and the optical film 162 and the reflective sheet 164 are disposed on the surface of the light guide plate 120, but the invention is not limited thereto. The cushioning member 150 is sandwiched between the housing 110 and the positioning member 130 and has elasticity. The material of the buffering member 150 may include rubber, silicone, foam or a combination thereof.

FIG. 3 is a perspective view showing the combination of the positioning member 130 and the cushioning member 150 in FIG. 2 . Referring also to FIGS. 2 and 3, the light guide plate 120 has The bottom surface 122 and the at least one side surface 124 of the abutting bottom surface 122. The positioning member 130 includes a limiting plate 132, a supporting plate 134 and a connecting plate 136. The connecting plate 136 abuts the limiting plate 132 and the supporting plate 134. The connecting plate 136 and the limiting plate 132 have an obtuse angle θ1. The support plate 134 is substantially parallel to the bottom plate 112 of the housing 110. As used herein, "substantial" means manufacturing errors, such as plus or minus 5 degrees, but not limited to this range. When the light guide plate 120 is located on the positioning member 130 , the limiting plate 132 can abut the side surface 124 of the light guide plate 120 , the support plate 134 can support the bottom surface 122 of the light guide plate 120 , and the connecting plate 136 can at least partially abut the housing 110 Base plate 112. That is to say, the positioning member 130 has the function of carrying and positioning the light guide plate 120 at the same time.

In the present embodiment, the connecting plate 136 includes the inclined portion 142 and the connected The connecting portion 144. The inclined portion 142 abuts the limiting plate 132, and the inclined portion 142 and the limiting plate 132 have an obtuse angle θ1. The connecting portion 144 abuts the inclined portion 142 and the support plate 134. The orthographic projection of the inclined portion 142 on the bottom plate 112 at least partially overlaps with the orthographic projection of the light guide plate 120 on the bottom plate 112. In this way, the abutment of the inclined portion 142 and the connecting portion 144 can abut against the bottom plate 112.

In addition, the connecting portion 144 is at an acute angle θ2 with the support plate 134, and is connected The orthographic projection of the joint 144 on the bottom plate 112 at least partially overlaps the orthographic projection of the support plate 134 on the bottom plate 112. That is to say, the support plate 134 extends in the direction D1 of the limiting plate 132, which saves space required for the positioning member 130 to be disposed. In the present embodiment, the positioning member 130 can be used for the light guide plate 120 that needs to support a small edge area, such as a light guide plate 120 that is smaller in size or lighter in weight.

The limiting plate 132 has opposite side edges 135, 137. among them, The side edge 137 of the limiting plate abuts the connecting plate 136, and between the two side edges 135, 137 The shortest distance H is greater than or equal to half the thickness D of the light guide plate 120. As a result, the light guide plate 120 is less likely to hit the sidewall 114 across the limiting plate 132 due to vibration.

The buffering member 150 is located on the surfaces 133 and 143 of the light guide plate 120 opposite to the inclined portion 142 of the limiting plate 132 and the connecting plate 136. The buffering member 150 is attached to the positioning member 130 by, for example, an adhesive (for example, a double-sided tape). Since the overall cross-sectional shape of the limiting plate 132 and the inclined portion 142 is V-shaped, and the cushioning member 150 has elasticity and can be bent, when the cushioning member 150 has not been attached to the positioning member 130, the designer can select the sectional shape as a rectangle. The cushioning member 150 is bent and attached to the positioning member 130, or is directly attached to the positioning member 130 by using a cushioning member 150 having a V-shaped cross section. After the assembly of the backlight module 100 is completed, the buffer member 150 can be stably sandwiched between the positioning member 130 and the housing 110, and the positioning member 130 can be prevented from being accommodated in the housing space 116 of the housing 110 (see FIG. 1). The external force transmitted from the housing 110 to the positioning member 130 and the light guide plate 120 can be reduced, and the light guide plate 120 can be prevented from being broken.

In addition, when assembling the backlight module 100, the buffer member 150 may be first used. Attached to the outer surface 133, 143 of the positioning member 130, the light guide plate 120 is attached to the limiting plate 132 and the supporting plate 134 of the positioning member 130, and finally the buffer member 150, the positioning member 130 and the light guide plate 120 are installed. Inside the housing 110. Since the connecting plate 136 and the limiting plate 132 have an obtuse angle θ1, and the cushioning member 150 attached to the positioning member 130 also has an obtuse angle θ1, it has a function of guiding into the casing 110. In this way, the cushioning member 150 can be easily installed in the housing 110 along with the positioning member 130, and is not easily peeled off or broken due to the side wall 114 of the friction housing 110 during assembly.

It should be understood that in the following description, the component connection relationships that have been described will not be repeated, and will be described first. In the following description, other types of support plates 134 and connecting plates 136 will be described.

4 is a cross-sectional view of a backlight module 100a according to an embodiment of the present invention, the cross-sectional position of which is the same as that of FIG. 2. FIG. 5 is a perspective view showing the combination of the positioning member 130 and the cushioning member 150 of FIG. 4. Referring to FIG. 4 and FIG. 5 simultaneously, the difference from the embodiment of FIG. 2 and FIG. 3 is that the connecting portion 144 and the supporting plate 134 are at an obtuse angle θ3, and the orthographic projection of the connecting portion 144 on the bottom plate 112 and the supporting plate are provided. The front projections of the 134 on the bottom plate 112 do not overlap. That is, the support plate 134 extends in a direction D2 away from the limit plate 132. In the present embodiment, the positioning member 130 can be used for the light guide plate 120 that needs to support a larger edge area, such as the light guide plate 120 having a larger size or a heavier weight.

FIG. 6 is a cross-sectional view showing a backlight module 100b according to an embodiment of the present invention, the cross-sectional position of which is the same as that of FIG. 2. FIG. 7 is a perspective view showing the combination of the positioning member 130 and the cushioning member 150 of FIG. 6 and 7 are different from the second and third embodiments in that the connecting portion 144 includes a first sub-portion 146 and a second sub-portion 148. The first portion 146 abuts the inclined portion 142. The second portion 148 abuts the first sub-portion 146 and the support plate 134. The first portion 146 is parallel to the support plate 134. The second portion 148 is substantially perpendicular to the first sub-portion 146. The orthographic projection of the first portion 146 on the bottom plate 112 at least partially overlaps the orthographic projection of the support plate 134 on the bottom plate 112. As a result, the connecting portion 144 is at a right angle θ4 with the support plate 134. In this embodiment, the positioning member 130 can be used to support a large edge area. The light guide plate 120 is, for example, a light guide plate 120 having a larger size or a heavier weight.

FIG. 8 is a flow chart showing a method of assembling a backlight module according to an embodiment of the present invention. First, in step S1, the buffering member is attached to the outer side of the positioning member, so that the buffering member is located on the connecting plate of the limiting plate of the positioning member and the adjacent limiting plate. Next, in step S2, the light guide plate is positioned on the inner side of the positioning member with respect to the cushioning member. Finally, in step S3, the buffer member, the positioning member and the light guide plate are mounted in the housing such that the buffer member is interposed between the housing and the positioning member.

The positioning component comprises a limiting plate, a supporting plate and a connecting plate adjoining the limiting plate and the supporting plate, and the connecting plate comprises an inclined portion and a connecting portion. The inclined portion abuts the limiting plate, and the inclined portion and the limiting plate are obtuse. The connecting portion abuts the inclined portion and the support plate. In step S1, the baffle may be further included such that a part of the cushioning member is attached to the limiting plate, and another portion of the cushioning member is attached to the inclined portion. In step S2, the side surface of the light guide plate may be abutted to the limiting plate, and the bottom surface of the light guide plate is supported by the support plate. In step S3, it may further include abutting the abutting portion of the connecting portion and the inclined portion to the housing.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified 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

110‧‧‧shell

112‧‧‧floor

114‧‧‧ side wall

120‧‧‧Light guide

122‧‧‧ bottom

124‧‧‧ side

130‧‧‧ Positioning parts

150‧‧‧ cushioning parts

162‧‧‧Optical diaphragm

164‧‧‧reflector

Claims (20)

A backlight module includes: a casing having a bottom plate and at least one side wall adjacent to the bottom plate; the bottom plate and the side wall together form an accommodating space; a light guide plate is located in the accommodating space, the light guide plate has a bottom surface and at least one side surface adjacent to the bottom surface; a positioning member comprising: a limiting plate against the side surface of the light guiding plate; a supporting plate supporting the bottom surface of the light guiding plate; and a connecting plate adjacent to the side a limiting plate and the supporting plate, and the connecting plate at least partially abuts the bottom plate, the connecting plate and the limiting plate have an obtuse angle; and a buffering member located at the limiting plate and the connecting plate facing away from the light guiding plate The surface of the buffer member is sandwiched between the housing and the positioning member. The backlight module of claim 1, wherein the connecting plate comprises: an inclined portion adjacent to the limiting plate, wherein the inclined portion and the limiting plate sandwich the obtuse angle; and a connecting portion adjacent to the inclined portion The support plate. The backlight module of claim 2, wherein the connecting portion and the supporting plate are at an acute angle such that the supporting plate extends toward the limiting plate. The backlight module of claim 2, wherein the connecting portion is at the bottom The orthographic projection of the plate at least partially overlaps the orthographic projection of the support plate on the base plate. The backlight module of claim 2, wherein the connecting portion and the supporting plate are at an obtuse angle such that the supporting plate extends away from the limiting plate. The backlight module of claim 2, wherein the orthographic projection of the inclined portion on the bottom plate at least partially overlaps with the orthographic projection of the light guide plate on the bottom plate. The backlight module of claim 2, wherein the abutting portion of the inclined portion and the connecting portion abut against the bottom plate. The backlight module of claim 2, wherein the connecting portion comprises: a first sub-portion adjacent to the inclined portion; and a second sub-portion adjacent to the first sub-portion and the support plate. The backlight module of claim 8, wherein the first portion is parallel to the support plate. The backlight module of claim 8, wherein the second sub-portion is substantially perpendicular to the first sub-portion. The backlight module of claim 8, wherein the first part is The orthographic projection on the base plate at least partially overlaps the orthographic projection of the support plate on the base plate. The backlight module of claim 2, wherein the limiting plate and the inclined portion have a V-shaped overall cross-sectional shape, and the buffer member has a V-shaped cross-sectional shape. The backlight module of claim 2, wherein the buffer member is attached to the surface of the limiting plate and the inclined portion facing away from the light guiding plate. The backlight module of claim 1, wherein the support plate is substantially parallel to the bottom plate. The backlight module of claim 1, wherein the limiting plate has opposite side edges, one of the two side edges abuts the connecting plate, and a shortest distance between the two side edges is greater than or equal to the light guiding plate Half the thickness. The backlight module of claim 1, wherein the material of the buffer member comprises rubber, silicone, foam or a combination thereof. A method for assembling a backlight module, comprising the steps of: attaching a buffering member to an outer side of a positioning member, wherein the buffering member is located on a limiting plate of the positioning member and a connecting plate adjacent to the limiting plate; Wherein, the connecting plate and the limiting plate have an obtuse angle; Positioning a light guide plate on the inner side of the locating member relative to the buffer member; and mounting the buffer member, the locating member and the light guide plate in a housing such that the buffer member is interposed between the housing and the positioning member between. The method of assembling a backlight module according to claim 17, wherein the positioning member comprises the limiting plate, a supporting plate and the connecting plate adjacent to the limiting plate and the supporting plate; and wherein the light guiding plate is positioned The positioning member is opposite to the inner side of the buffer member: a side of the light guide plate abuts against the limiting plate, and the bottom surface of the light guide plate is supported by the supporting plate. The method of assembling a backlight module according to claim 18, wherein the connecting plate comprises an inclined portion and a connecting portion, the inclined portion abuts the limiting plate, and the inclined portion and the limiting plate sandwich the obtuse angle, The connecting portion abuts the inclined portion and the supporting plate; and wherein attaching the cushioning member to the outer side of the positioning member comprises: bending the buffering member such that a part of the cushioning member is attached to the limiting plate, the cushioning member Another part is attached to the inclined portion. The method of assembling a backlight module according to claim 19, wherein the buffer member, the positioning member and the light guide plate are mounted in the housing, and the abutting portion of the connecting portion and the inclined portion abuts against the shell body.