CN109493731B - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN109493731B CN109493731B CN201910057370.1A CN201910057370A CN109493731B CN 109493731 B CN109493731 B CN 109493731B CN 201910057370 A CN201910057370 A CN 201910057370A CN 109493731 B CN109493731 B CN 109493731B
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- bottom plate
- wall
- backlight module
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- limiting
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- 230000000903 blocking effect Effects 0.000 claims abstract description 68
- 230000004888 barrier function Effects 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 2
- 239000012788 optical film Substances 0.000 description 30
- 238000009792 diffusion process Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a backlight module which comprises a back frame, an upper frame and a supporting plate. The back frame is provided with a bottom plate and a first limiting wall. The first limiting wall is erected on the upper surface of the bottom plate and is adjacent to the first edge of the bottom plate. In the vertical projection direction of the bottom plate, a space is formed between the vertical projection of the outer surface of the first limiting wall and the vertical projection of the first edge of the bottom plate. An accommodating part is formed between the outer surface of the first limiting wall and the first edge of the bottom plate. The upper frame is provided with a top cover and a blocking wall. The retaining wall is connected with the lower surface of the top cover. At least part of the blocking wall is positioned outside the outer surface of the first limiting wall and the blocking wall is abutted against the back frame. The retaining wall extends into the receiving portion. The support plate is located in a space between the bottom plate and the top cover, wherein the upper surface of the first stopper wall does not go beyond the extension plane of the upper surface of the support plate. The invention can improve the display quality.
Description
Technical Field
The present invention relates to a backlight module, and more particularly, to a backlight module with a narrow bezel.
Background
The current display device design trend is developed from the previous large and heavy appearance toward the direction of thinning and light weight, and the thickness of the frame of the backlight module gradually trends to the design of a narrow frame, so that the volume of the frame of the backlight module is reduced, and under the display device with the same size, the area of the display picture which can be viewed by the display panel is larger, and the visual effect is better.
In general, in a conventional backlight module, an upper frame is disposed on a back frame, and an optical film is located in a space between a top cover of the upper frame and a bottom plate of the back frame. However, in the conventional backlight module, the optical film may expand or contract due to a temperature change, and the optical film may be abutted against the side of the backlight frame to generate wrinkles, thereby affecting the display quality.
Disclosure of Invention
An embodiment of the invention provides a backlight module, which includes a back frame, an upper frame and a supporting plate. The back frame is provided with a bottom plate and a first limiting wall. The first limiting wall is erected on the upper surface of the bottom plate and is adjacent to the first edge of the bottom plate. In the vertical projection direction of the bottom plate, a space is formed between the vertical projection of the outer surface of the first limiting wall and the vertical projection of the first edge of the bottom plate. An accommodating part is formed between the outer surface of the first limiting wall and the first edge of the bottom plate. The upper frame is provided with a top cover and a blocking wall. The retaining wall is connected with the lower surface of the top cover. At least part of the blocking wall is positioned outside the outer surface of the first limiting wall and the blocking wall is abutted against the back frame. The retaining wall extends into the accommodating part, the supporting plate is positioned in a space between the bottom plate and the top cover, and the upper surface of the first limiting wall does not cross the extending surface of the upper surface of the supporting plate.
The supporting plate is a light guide plate, and the first limiting wall limits the position of the light guide plate in the space.
The backlight module further comprises a light source, the supporting plate is a diffusion plate, and the light source is located between the bottom plate of the back frame and the diffusion plate.
The back frame further comprises a supporting element, wherein the supporting element is abutted against the diffusion plate and is positioned between the bottom plate of the back frame and the diffusion plate.
Wherein, the blocking wall of the upper frame is abutted against the bottom plate of the back frame.
Wherein, a lower surface of the baffle wall is a plane.
Wherein, a notch is arranged on the lower surface of the retaining wall, the notch is provided with a groove surface sunken in the lower surface of the retaining wall, and the groove surface of the notch is abutted against the bottom plate.
Wherein, in the vertical projection direction of the bottom plate, a thickness of the blocking wall is less than or equal to the distance.
The optical film is positioned on the upper surface of the supporting plate, and the upper surface of the first limiting wall is lower than an extending surface of a lower surface of the optical film.
The back frame further has a side wall standing on the upper surface of the bottom plate and disposed corresponding to a second edge of the bottom plate, and a vertical projection of an outer surface of the side wall overlaps a vertical projection of the second edge of the bottom plate in the vertical projection direction of the bottom plate.
Wherein, the light source is positioned between the side wall and the supporting plate.
Wherein an upper surface of the sidewall extends over the extended surface of the upper surface of the support plate.
Wherein an upper surface of the sidewall abuts the lower surface of the top cover.
The retaining wall further includes a flap, the flap is located in the space between the bottom plate and the top cover and extends toward the supporting plate, and the flap abuts against the upper surface of the first limiting wall.
Wherein, an extension surface of a lower surface of the baffle wall is arranged between the upper surface of the bottom plate and the upper surface of the first limiting wall.
In summary, in the backlight module according to the embodiment of the invention, the retaining wall extends into the accommodating portion formed between the outer surface of the first limiting wall and the first edge of the bottom plate and is capable of abutting against the back frame, so that at least a portion of the retaining wall can be retracted into the range of the bottom plate. Compared with the prior backlight module, the embodiment of the invention can omit at least part of the thickness of the blocking wall. In addition, because the upper surface of the first limiting wall is lower than or equal to the extension surface of the upper surface of the supporting plate, a larger lateral extension space is reserved for the optical film above the supporting plate, and thus, when the backlight module is used for a long time or under environmental conditions, the optical film expands and extends laterally, the optical film cannot abut against the upper frame.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is an external view of a display device having a backlight module according to an embodiment of the invention.
FIG. 2 is a cross-sectional view of the display device of FIG. 1 taken along line A-A.
Fig. 3 is a schematic side view of a backlight module according to an embodiment of the invention.
Fig. 4 is a schematic side view of a backlight module according to another embodiment of the invention.
Fig. 5 is a schematic side view of a backlight module according to another embodiment of the invention.
FIG. 6A is a cross-sectional view of a display device corresponding to another embodiment with section line A-A as shown in FIG. 1.
FIG. 6B is a partial perspective view of the embodiment shown in FIG. 6A.
FIG. 7 is a cross-sectional view of a backlight module corresponding to another embodiment of the embodiment of FIG. 1 with A-A taken as a cross-sectional line.
Fig. 8 is a schematic top view of a backlight module according to an embodiment of the invention.
Fig. 9 is a schematic top view of a backlight module according to an embodiment of the invention.
FIG. 10A is a cross-sectional view of the backlight module corresponding to the cross-sectional line B-B of FIG. 9.
Fig. 10B is a schematic cross-sectional view of a display device having a backlight module according to an embodiment of the invention.
Fig. 11 is a schematic top view of a backlight module according to another embodiment of the invention.
Fig. 12 is a schematic cross-sectional view of a display device having a backlight module according to an embodiment of the invention.
Wherein, the reference numbers:
1 display device 100 backlight module
110 back frame 111 bottom plate
111a upper surface 112 limiting wall
1121 the upper surface of the first stopper wall 1121a
1121c outer surface 1122 second retaining wall
1122c outer surface 1123 third limiting wall
1123c outer surface 1124 fourth limiting wall
113 side wall 113a upper surface
113c outer surface 120 upper frame
121 roof 122 wall
121b lower surface 122b lower surface
122c inner surface 1221 flap
130 supporting plate/light guide plate 130a upper surface
140 optical film 140b lower surface
140c side surface 150 light source
160 support plate 160a upper surface
170 supporting component 180 circuit substrate
190 reflective sheet 200 display panel
C chamfer D1 vertical projection direction
E convex part H holding part
E1 extension plane E2 extension plane
Distance of E3 extending surface F
L1 first edge L2 second edge
N notch N1 grooved surface
P gap S space
Thickness of T
Detailed Description
Fig. 1 is an external view of a display device 1 having a backlight module 100 according to an embodiment of the invention. Fig. 2 is a schematic cross-sectional view of the display device 1 of fig. 1 taken along a-a. Referring to fig. 1 and 2, the display device 1 includes a backlight module 100 and a display panel 200. The backlight module 100 includes a back frame 110, an upper frame 120, and a support plate 130. The back frame 110 is combined with the upper frame 120, and the support plate 130 is located in a space S between the back frame 110 and the upper frame 120.
The back frame 110 has a bottom plate 111 and at least one limiting wall 112 (e.g., a first limiting wall 1121 shown in fig. 2) connected to the bottom plate 111. The first limiting wall 1121 is erected on the upper surface 111a of the bottom plate 111, and the first limiting wall 1121 is adjacent to the first edge L1 of the bottom plate 111. In the vertical projection direction D1 of the bottom plate 111, a distance F is formed between the vertical projection of the outer surface 1121c of the first limiting wall 1121 and the vertical projection of the first edge L1 of the bottom plate 111. Therefore, the perpendicular projection of the outer surface 1121c of the first stopper wall 1121 does not overlap with the perpendicular projection of the first edge L1 of the bottom plate 111. That is, the outer surface 1121c of the first stopper wall 1121 is not aligned with the first edge L1 of the bottom plate 111. An accommodating portion H is formed between the outer surface 1121c of the first stopper wall 1121 and the first edge L1 of the bottom plate 111. That is, the accommodating portion H is formed by the outer surface 1121c of the first stopper wall 1121 and a portion of the bottom plate 111 between the outer surface 1121c and the first edge L1.
The upper frame 120 has a top cover 121 and a blocking wall 122. The blocking wall 122 is connected to the lower surface 121b of the top cover 121. The top cover 121 may be used to carry the display panel 200. At least a portion of the retaining wall 122 is located outside the outer surface 1121c of the first limiting wall 1121. The retaining wall 122 abuts against the back frame 110, and the retaining wall 122 extends into the accommodating portion H. In other words, the blocking wall 122 extends toward the bottom plate 111 and over the upper surface 1121a of the first limiting wall 1121 to extend to the accommodating portion H. Here, in the vertical projection direction D1 of the bottom plate 111, the vertical projection of the blocking wall 122 at least partially overlaps the vertical projection of the bottom plate 111. In other words, at least a portion of the blocking wall 122 can be retracted into the range of the bottom plate 111. In one embodiment, as shown in fig. 2, in the vertical projection direction D1 of the bottom plate 111, the thickness T of the blocking wall 122 is smaller than or equal to the distance F, and herein, the vertical projection of the blocking wall 122 does not exceed the vertical projection of the first edge L1 and all the blocking walls 122 can be retracted into the range of the bottom plate 111. In another embodiment (not shown), the thickness T of the blocking wall 122 is greater than the distance F, and thus, in the vertical projection direction D1 of the bottom plate 111, the vertical projection of the blocking wall 122 may slightly exceed the vertical projection of the first edge L1 and a portion of the blocking wall 122 may be retracted into the range of the bottom plate 111.
The supporting plate 130 is located in the space S between the bottom plate 111 of the back frame 110 and the top cover 121 of the upper frame 120, and the upper surface 1121a of the first limiting wall 1121 is lower than or equal to the extension surface E1 of the upper surface 130a of the supporting plate 130. That is, the first limiting wall 1121 extends toward the top cover 121, and the upper surface 1121a of the first limiting wall 1121 does not exceed the extension plane E1 of the upper surface 130a of the supporting plate 130. In this embodiment, the supporting plate 130 may be the light guide plate 130, and the first position-limiting wall 1121 limits the position of the light guide plate 130 in the space S. In some embodiments, the support plate 130 may be a diffuser plate.
Here, the retaining wall 122 can extend into the accommodating portion H formed between the outer surface 1121c of the first limiting wall 1121 and the first edge L1 of the bottom plate 111 and can abut against the back frame 110, so that at least a portion of the retaining wall 122 can be retracted into the range of the bottom plate 111 to omit at least a portion of the thickness of the retaining wall 122.
The upper surface 1121a of the first stopper wall 1121 may have a distance from the lower surface 121b of the top cover 121. In other words, the upper surface 1121a of the first stopper wall 1121 does not abut against the lower surface 121b of the top cover 121. In this case, the upper frame 120 may be abutted against the back frame 110 by different embodiments of the blocking wall 122.
In an embodiment of the blocking wall 122, as shown in fig. 2, the blocking wall 122 extends toward the bottom plate 111, and the lower surface 122b of the blocking wall 122 contacts the bottom plate 111 of the back frame 110. Thereby, the lower surface 122b of the blocking wall 122 can abut against the bottom plate 111 of the back frame 110.
Fig. 3 is a schematic side view of a backlight module 100 according to an embodiment of the invention. In this embodiment, as shown in fig. 3, from a side view of the backlight module 100, the lower surface 122b of the blocking wall 122 is a plane and the upper surface 111a of the bottom plate 111 is a plane, and the lower surface 122b of the blocking wall 122 may abut against the upper surface 111a of the bottom plate 111.
Fig. 4 is a schematic side view of a backlight module 100 according to another embodiment of the invention. In this embodiment, as shown in fig. 4, the lower surface 122b of the blocking wall 122 has at least one notch N when viewed from the side of the backlight module 100. The recess N has a recess surface N1, and the recess surface N1 is recessed in the lower surface 122b of the blocking wall 122. The base 111 may have at least one protrusion E, and the position and number of the protrusion E correspond to the position and number of the recess N. The groove surface N1 of the notch N abuts the convex portion E of the bottom plate 111.
Fig. 5 is a schematic side view of a backlight module 100 according to another embodiment of the invention. In this embodiment, as shown in fig. 5, for example, at least one chamfer (chamfer) C is formed on an edge of the lower surface 122b of the retaining wall 122, and a chamfer surface of the chamfer C faces the outer surface 1121C of the first limiting wall 1121.
Referring to fig. 6A to 6B, fig. 6A is a schematic cross-sectional view of a display device 1 corresponding to another embodiment of the embodiment shown in fig. 1 with a-a taken as a cross-section line. Fig. 6B is a partial perspective view of the upper frame of the embodiment shown in fig. 6A. In this embodiment, the blocking wall 122 further includes a flap 1221, for example, and the flap 1221 is located in the space S between the bottom plate 111 and the top cover 121. The flap 1221 is formed by punching a portion of the blocking wall 122 and then bending, the flap 1221 is substantially perpendicular to the non-bent portion of the blocking wall 122, and the flap 1221 extends from the non-bent portion of the blocking wall 122 toward the supporting plate 130 and abuts against the upper surface 1121a of the first limiting wall 1121. Here, the flap 1221 allows the blocking wall 122 to abut against the upper surface 1121a of the first position-limiting wall 1121 of the back frame 110. In this embodiment, as shown in fig. 6A, the extending surface of the lower surface 122b of the blocking wall 122 is, for example, between the upper surface 111a of the bottom plate 111 and the upper surface 1121a of the first limiting wall 1121. That is, the lower surface 122b of the blocking wall 122 does not abut against the bottom plate 111 of the back frame 110, and the blocking wall 122 may abut against the back frame 110 only by the flap 1221.
In another variation of the blocking wall 122, as shown in fig. 7, the blocking wall 122 extends toward the bottom plate 111, the lower surface 122b of the blocking wall 122 contacts the bottom plate 111 of the back frame 110, and the flap 1221 abuts against the upper surface 1121a of the first position-limiting wall 1121. Here, the lower surface 122b of the blocking wall 122 can abut against the bottom plate 111 of the back frame 110, and by the arrangement of the flap 1221, the blocking wall 122 can be supported on the first limiting wall 1121 of the back frame 110.
Referring to fig. 2 again, in this embodiment, the backlight module 100 may further include an optical film 140. The optical film 140 is positioned on the upper surface 130a of the support plate 130 (e.g., light guide plate). The upper surface 1121a of the first limiting wall 1121 is lower than the extending surface of the lower surface 140b of the optical film 140, and the first limiting wall 1121 does not intervene in the gap P between the side surface 140c of the optical film 140 and the inner surface 122c of the blocking wall 122, so that the height of the first limiting wall 1121 can be reduced to make the first limiting wall 1121 not exceed the extending surface E1 of the upper surface 130a of the supporting plate 130, so that the gap P is formed between the optical film 140 and the blocking wall 122 to accommodate the expansion and contraction of the optical film 140 caused by the assembly tolerance or temperature change. In addition, the number of the optical films 140 shown in fig. 1 is only one, but in other embodiments, the number of the optical films 140 may be multiple. In one embodiment, the optical films 140 can be, for example, but not limited to, a diffusion sheet, a reflection sheet, a light collecting sheet, or a composite optical film.
Fig. 8 is a schematic top view of a backlight module 100 according to an embodiment of the invention. It should be noted that, in order to clearly show the connection relationship of the elements, the top cover 121, the supporting plate 130, the optical film 140 and the light source 150 of the upper frame 120 are omitted, so that the arrangement between the limiting wall 112 and the blocking wall 122 can be shown. Referring to fig. 8, the back frame 110 has, for example, four limiting walls 112 (here, a first limiting wall 1121, a second limiting wall 1122, a third limiting wall 1123, and a fourth limiting wall 1124). The first, second, third and fourth limiting walls 1121, 1122, 1123 and 1124 surround the supporting plate 130 (not shown) to form a rectangular frame, and the limiting walls 112 form the rectangular frame, which can be achieved by connecting the limiting walls 112 with each other or by disconnecting them from each other, however, the invention is not limited thereto. The upper frame 120 has four blocking walls 122, and the blocking walls 122 respectively surround the four limiting walls 112 (here, the first limiting wall 1121, the second limiting wall 1122, the third limiting wall 1123, and the fourth limiting wall 1124) and are located at the accommodating portion H, and form rectangular frames with each other, and similarly, the blocking walls 122 may form the rectangular frames with each other connected or without each other connected, however, the invention is not limited thereto. In this embodiment, in the vertical projection direction D1 of the bottom plate 111, the thickness T of the blocking wall 122 is smaller than the distance F, and herein, the vertical projection of the blocking wall 122 does not exceed the vertical projection of the bottom plate 111 and all the blocking walls 122 can be retracted into the range of the bottom plate 111.
Referring to fig. 9 and 10A, fig. 9 is a schematic top view of a backlight module 100 according to an embodiment of the invention. Fig. 10A is a cross-sectional view of the backlight module 100 corresponding to the cross-sectional line B-B of fig. 9. It should be noted that, in order to clearly show the connection relationship of the elements, the top cover 121, the supporting plate 130 and the optical film 140 of the upper frame 120 are omitted, so that the arrangement among the limiting wall 112, the side wall 113 and the blocking wall 122 can be shown. The back frame 110 may further have at least one sidewall 113, and two ends of the sidewall 113 are connected to the limiting wall 112. The connection can be a connection, an adjacent connection or an integral connection, and the invention is not limited. The sidewall 113 stands on the upper surface 111a of the bottom plate 111 and is disposed corresponding to the second edge L2 of the bottom plate 111. In the vertical projection direction D1 of the bottom plate 111, the vertical projection of the outer surface 113c of the side wall 113 overlaps the vertical projection of the second edge L2 of the bottom plate 111. That is, the outer surface 113c of the sidewall 113 is aligned with the second edge L2 of the bottom panel 111 without a space. In this embodiment, as shown in fig. 9 and fig. 10A, the back frame 110 has, for example, three limiting walls 112 (here, a first limiting wall 1121, a second limiting wall 1122, and a third limiting wall 1123) and a side wall 113. The first limiting wall 1121, the second limiting wall 1122, the third limiting wall 1123 and the side wall 113 respectively surround the support plate 130 (not shown in the drawings) and form a rectangular frame with each other. The upper frame 120 has four retaining walls 122, and the retaining walls 122 surround the three limiting walls 112 (here, the first limiting wall 1121, the second limiting wall 1122, and the third limiting wall 1123) and one side wall 113 respectively, and form a rectangular frame with each other. The accommodating portion H is formed between the outer surface 1121c of the first limiting wall 1121, the outer surface 1122c of the second limiting wall 1122, and the outer surface 1123c of the third limiting wall 1123, and each first edge L1 of the bottom plate 111. Since the outer surface 113c of the sidewall 113 is aligned with the second edge L2 of the bottom plate 111 without a space, the blocking wall 122 of the corresponding sidewall 113 is close to (or attached to) the outer surface 113c of the sidewall 113. Here, in the vertical projection direction D1 of the bottom plate 111, the vertical projection of the blocking wall 122 exceeds the vertical projection of the bottom plate 111.
In this embodiment, as shown in fig. 10A, the backlight module 100 further includes a light source 150, the light source 150 is disposed on a circuit substrate 180, and the circuit substrate 180 is, for example, a rigid printed circuit board or a flexible printed circuit board. The distance between the side wall 113 and the closest side surface of the supporting plate 130 (e.g., the light guide plate) is larger than the distance between the limiting wall 112 and the closest side surface of the supporting plate 130, so that a space can be formed between the side wall 113 and the side surface of the supporting plate 130 for disposing the light source 150 and providing a light mixing distance for the light source 150. Here, the light source 150 may be disposed between the sidewall 113 and the support plate 130. The Light source 150 may be a Light-Emitting Diode (LED), a Micro LED, an Organic Light-Emitting Diode (OLED), a Cold-Cathode Fluorescent lamp (CCFLs), or an Electroluminescence Element (EL). Here, the backlight module 100 is exemplified by a side edge type backlight module (side edge type backlight module), and the invention is not limited thereto. In addition, the backlight module 100 further includes a reflective sheet 190, and in the view shown in fig. 10A, the reflective sheet 190 is substantially L-shaped, one portion is located between the first limiting wall 1121 and the supporting plate 130 (e.g., a light guide plate), and the other portion is located between the supporting plate 130 and the bottom plate 111.
Fig. 10B is a schematic cross-sectional view of a display device 1 having a backlight module 100 according to an embodiment of the invention. One difference from the embodiment shown in fig. 10A is that the backlight module 100 includes a direct-type light incident structure. The backlight module 100 further includes a supporting plate 160, such as a diffuser plate, having a rigidity higher than that of the optical film 140, the supporting plate 160 is located between the top covers 121 of the bottom plate 111, wherein an upper surface 1121a of the first limiting wall 1121 is lower than or equal to an extension surface E2 of the upper surface 160a of the supporting plate 160. The light source 150 is disposed between the bottom plate 111 of the back frame 110 and the supporting plate 160 (e.g., a diffusion plate), and in one embodiment, the light source 150 is disposed on the circuit substrate 180. In addition, the backlight module 100 further includes a supporting member 170 located between the bottom plate 111 and the supporting plate 160 and abutting against the supporting plate 160. In some embodiments, the support member 170 is made of a plastic material, for example. The optical film 140 is disposed on the upper surface 160a of the support plate 160 (e.g., a diffusion plate), and the upper surface 1121a of the first limiting wall 1121 is lower than the extension surface of the lower surface 140b of the optical film 140. With the structural design of the backlight module 100, the optical film 140 will not abut against the first position-limiting portion 1121 due to thermal expansion.
Fig. 11 is a schematic top view of a backlight module 100 according to another embodiment of the invention. It should be noted that, in order to clearly show the connection relationship of the components, the top cover 121, the supporting plate 130, the optical film 140 and the light source 150 of the upper frame 120 are omitted, so that the arrangement among the limiting wall 112, the side wall 113 and the blocking wall 122 can be shown. The back frame 110 has two opposite limiting walls 112 (here, a first limiting wall 1121 and a second limiting wall 1122) and two opposite side walls 113. The first limiting wall 1121, the second limiting wall 1122, and the two side walls 113 respectively surround the support plate 130 (not shown in the figures), and form a rectangular frame with each other. The upper frame 120 has four retaining walls 122, and the retaining walls 122 respectively surround the two limiting walls 112 (here, the first limiting wall 1121 and the second limiting wall 1122) and the two side walls 113, and form a rectangular frame with each other. The accommodating portion H is formed between the outer surface 1121c of the first stopper wall 1121 and the outer surface 1122c of the second stopper wall 1122, and each first edge L1 of the bottom plate 111. Since the outer surface 113c of the sidewall 113 is aligned with the second edge L2 of the bottom plate 111 without a space, the blocking wall 122 of the corresponding sidewall 113 is close to (or attached to) the outer surface 113c of the sidewall 113. Here, in the vertical projection direction D1 of the bottom plate 111, the vertical projection of the blocking wall 122 exceeds the vertical projection of the bottom plate 111.
In the above description, the rectangular frames may be connected, adjacent but not connected to each other, however, the invention is not limited thereto.
Fig. 12 is a schematic cross-sectional view of a display device 1 having a backlight module 100 according to an embodiment of the invention. In this embodiment, the upper surface 113a of the sidewall 113 extends over the extension surface E3 of the upper surface 130a of the support plate 130 (e.g., light guide plate). That is, the sidewall 113 extends toward the top cover 121, and the upper surface 113a of the sidewall 113 passes over the extension plane E3 of the upper surface 130a of the support plate 130. In this embodiment, the upper surface 113a of the sidewall 113 may abut the lower surface 121b of the top cover 121. Therefore, the side wall 113 abuts against the top cover 121 so that the upper frame 120 abuts against the back frame 110 corresponding to the second edge L2 side of the bottom plate 111, which contributes to the structural strength. Here, the backlight module 100 is exemplified by a side-incident backlight module, which is not limited to the present invention, and can also be used in a direct-incident backlight module.
In summary, in the backlight module according to the embodiment of the invention, the retaining wall extends into the accommodating portion formed between the outer surface of the first limiting wall and the first edge of the bottom plate and is capable of abutting against the back frame, so that at least a portion of the retaining wall can be retracted into the range of the bottom plate. Compared with the conventional backlight module, the embodiment of the invention can omit the thickness of the blocking wall. In addition, because the upper surface of the first limiting wall is lower than or equal to the extension surface of the upper surface of the supporting plate, for the optical film positioned on the supporting plate, a lateral extension space is left between the upper frame and the optical film, so that the optical film cannot be damaged by contacting the upper frame when the optical film expands laterally under long-term use of the backlight module or other environmental conditions.
Although the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, and that various other modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (14)
1. A backlight module, comprising:
the back frame is provided with a bottom plate and a first limiting wall, the first limiting wall is erected on the upper surface of the bottom plate and is adjacent to a first edge of the bottom plate, a space is formed between the vertical projection of the outer surface of the first limiting wall and the vertical projection of the first edge of the bottom plate in the vertical projection direction of the bottom plate, and a containing part is formed between the outer surface of the first limiting wall and the first edge of the bottom plate;
the upper frame is provided with a top cover and a blocking wall, the blocking wall is connected with the lower surface of the top cover, at least part of the blocking wall is positioned outside the outer surface of the first limiting wall, the blocking wall is abutted against the back frame, and the blocking wall extends into the accommodating part;
a supporting plate located in a space between the bottom plate and the top cover, wherein an upper surface of the first limiting wall does not cross an extending surface of an upper surface of the supporting plate; and
the optical diaphragm is positioned on the upper surface of the supporting plate, and the upper surface of the first limiting wall is lower than an extending surface of a lower surface of the optical diaphragm.
2. The backlight module of claim 1, wherein the supporting plate is a light guide plate, and the first position-limiting wall limits the position of the light guide plate in the space.
3. The backlight module of claim 1, further comprising a light source, wherein the supporting plate is a diffuser plate, and the light source is disposed between the bottom plate of the back frame and the diffuser plate.
4. The backlight module of claim 3, further comprising a supporting member, wherein the supporting member abuts against the diffuser plate, and the supporting member is located between the bottom plate of the back frame and the diffuser plate.
5. The backlight module of claim 1, wherein the blocking wall of the top frame abuts against the bottom plate of the back frame.
6. The backlight module of claim 1, wherein a lower surface of the barrier wall is planar.
7. The backlight module of claim 1, wherein a lower surface of the blocking wall has a recess, the recess has a recessed surface recessed in the lower surface of the blocking wall, and the recessed surface of the recess abuts against the bottom plate.
8. The backlight module of claim 1, wherein a thickness of the barrier wall is less than or equal to the distance in the vertical projection direction of the bottom plate.
9. The backlight module of claim 1, wherein the back frame further has a sidewall standing on the upper surface of the bottom plate and disposed corresponding to a second edge of the bottom plate, and a vertical projection of an outer surface of the sidewall overlaps a vertical projection of the second edge of the bottom plate in the vertical projection direction of the bottom plate.
10. The backlight module of claim 9, further comprising a light source disposed between the sidewall and the supporting plate.
11. The backlight module of claim 9, wherein an upper surface of the sidewall extends over the extended surface of the upper surface of the supporting plate.
12. The backlight module of claim 9, wherein an upper surface of the sidewall abuts the lower surface of the top cover.
13. The backlight module of claim 1, wherein the blocking wall further comprises a flap, the flap is located in the space between the bottom plate and the top cover and extends toward the supporting plate, and the flap abuts against the upper surface of the first limiting wall.
14. The backlight module of claim 13, wherein an extending surface of a lower surface of the blocking wall is disposed between the upper surface of the bottom plate and the upper surface of the first limiting wall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW107146010 | 2018-12-19 | ||
| TW107146010A TWI681231B (en) | 2018-12-19 | 2018-12-19 | Backlight module |
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| Publication Number | Publication Date |
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| CN109493731A CN109493731A (en) | 2019-03-19 |
| CN109493731B true CN109493731B (en) | 2020-12-08 |
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| CN201910057370.1A Active CN109493731B (en) | 2018-12-19 | 2019-01-22 | Backlight module |
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| CN (1) | CN109493731B (en) |
| TW (1) | TWI681231B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111239885A (en) * | 2020-03-04 | 2020-06-05 | 友达光电（苏州）有限公司 | Backlight module and display device |
| CN115413330A (en) | 2021-03-26 | 2022-11-29 | 瑞仪(广州)光电子器件有限公司 | Optical film, backlight module and display device |
| CN115390316A (en) * | 2022-09-28 | 2022-11-25 | 惠科股份有限公司 | Backlight module and display device |
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Also Published As
| Publication number | Publication date |
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| TWI681231B (en) | 2020-01-01 |
| TW202024730A (en) | 2020-07-01 |
| CN109493731A (en) | 2019-03-19 |
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