TWI407206B - Light source assembly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to improve quality and reliability of a light source assembly as well as life and emission efficiency of light-emitting elements. <P>SOLUTION: The light source assembly includes a back plate equipped with a bottom part and at least one side part, with the side part and the bottom part at a given angle, with the bottom part having at least a first retaining hole and a second retaining hole formed, a light bar, to be affixed to the side part of the back plate, of an oblong external form and equipped with a first end and a second end opposed to each other in a longer axis direction, with the first retaining hole of the back plate in adjacency to its first end and with the second retaining hole in adjacency to its second end, a first retaining tool with one end in contact with the light bar and the other end insertion-fitted into the first retaining hole, and a second retaining tool with one end in contact with the light bar and the other end insertion-fitted into the second retaining hole. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

Light source assembly

The invention relates to a light source assembly.

In terms of technology and cost, the backlight module is gradually improved in the way of fixing the light bar. The early light strips are fixed to the back plate by means of thermal pads and screwing, and are usually fixed to the back plate by adhesive attachment. As shown in the light source assembly 100 of FIG. 1, a light bar 104 is adhered to the back plate 102 by a thermal tape 106. However, the heat-conductive double-sided tape 106 is liable to cause peeling or peeling, and in particular, the head and the tail ends of the light bar 104 are more prominently adhered. When one end of the thermal double-sided tape 106 between the light bar 104 and the back plate 102 is peeled off, the positioning reliability between the light bar 104 and the back plate 102 is reduced. If the deterioration is further caused, the light bar 104 is gradually degummed. The heat generated by the light source is concentrated and is not easily dissipated, resulting in a decrease in optical efficiency and deteriorating the performance, reliability and quality of a backlight module as a whole. In addition, Taiwan Patent Publication No. 200811522, 201007276, 200928500 and U.S. Patent Publication No. 20080186425 disclose the fixing manner of the light source of the backlight module.

The invention provides a light source assembly, which has good positioning reliability, and can prevent the light bar from warping, peeling off and the light bar from being impacted by the light guide plate.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. To achieve one or a part or all of the above or other purposes, an embodiment of the present invention provides a light source assembly including a back panel, a light bar, a first fastening component, and a second fastening component. The back plate has a bottom portion and at least one side portion, the side portion is at an angle to the bottom portion, and the bottom portion is formed with at least one first button hole and a second button hole. The light bar is attached to the side of the back plate, the light bar has a longitudinal shape and has a first end and a second end in a long axis direction, wherein the first button hole of the back plate is adjacent to the light bar The first end and the second buttonhole are adjacent to the second end of the light bar. One end of the first fastening component abuts the light bar and the other end is embedded with the first fastening hole. One end of the second fastening component abuts the light bar and the other end is embedded with the second fastening hole.

In an embodiment, the first fastening component and the second fastening component may be formed of an elastic material.

In one embodiment, the first fastening component has at least one first latch, and the second latching component has at least one second latch, the first latch is embedded in the first latching hole and the second latching is embedded in the second latching hole. The first cassette and the second cassette respectively have a T-shaped cross-sectional shape, and the first button hole and the second button hole respectively have a T-shaped cross-sectional shape.

In one embodiment, the light bar has a plurality of light emitting elements and a first connector and a second connector disposed on opposite sides of the light emitting element, the first latching member has a first gap on a side of the light bar and The first notch accommodates the first connector, the second fastening member has a second notch on a side of the light bar, and the second notch accommodates the second connector.

Another embodiment of the present invention provides a light source assembly including a back plate, a heat sink, a light bar, a first fastening component, and a second fastening component. The back plate is disposed on a bottom side of a light guide plate, and the heat sink is disposed at a position adjacent to a light incident surface of the light guide plate and connected to one side of the back plate. The heat sink has a bottom portion and a side portion, and the bottom portion is formed with at least one first button hole and a second button hole, and the side portion is at an angle with the bottom portion. The light bar is attached to one side of the heat sink, and the light bar has a first end and a second end in a long axis direction, wherein the first button hole of the heat sink is adjacent to the first end of the light bar and The second buttonhole is adjacent to the second end of the light bar. One end of the first fastening component abuts the light bar and the other end is embedded with the first fastening hole. One end of the second fastening component abuts the light bar and the other end is embedded with the second fastening hole.

Another embodiment of the present invention provides a light source assembly including a back plate, at least two light bars, a first fastening component, a second fastening component and a third fastening component. The back plate has a bottom portion and at least one side portion, the bottom portion is at an angle with the side portion, and the bottom portion has at least one first button hole, a second button hole and a third button hole. At least two light bars are attached to the side of the backboard, and two adjacent light bars are connected to each other and form a joint. The first buttonhole, the second buttonhole, and the third buttonhole are formed adjacent to the left end, the right end, and the contact point of the two connected light bars, respectively. One end of the first fastening member abuts against the left end of the two connected light bars and the other end is embedded in the first fastening hole. One end of the second fastening member abuts against the right end of the two connected light bars and the other end is embedded in the second fastening hole. One end of the third fastening member abuts against the joint and the other end is embedded in the third fastening hole.

Another embodiment of the present invention provides a light source assembly including a back plate, a heat sink, at least two light bars, a first fastening component, a second fastening component, and a third fastening component. The back plate is disposed on a bottom side of a light guide plate. The heat sink is disposed at a position adjacent to a light incident surface of the light guide plate. The heat sink has a bottom portion and a side portion, and the bottom portion has at least one first button hole, a second button hole and a third button hole. One side of the plate is at an angle to the side. At least two light bars are attached to the side of the heat sink, and two adjacent light bars are connected to each other and form a contact point, and the first button hole, the second button hole and the third button hole are respectively formed adjacent to the two connected lights. The left end, the right end of the strip and the joint. One end of the first fastening member abuts against the left end of the two connected light bars and the other end is embedded in the first fastening hole. One end of the second fastening member abuts against the right end of the two connected light bars and the other end is embedded in the second fastening hole. One end of the third fastening member abuts against the joint and the other end is embedded in the third fastening hole.

Another embodiment of the present invention provides a light source assembly including a back plate, a heat sink, at least two light bars, a first fastening component, a second fastening component, and a pressing piece. The back plate has a bottom portion and at least one side portion, the bottom portion is at an angle with the side portion, and the bottom portion has at least one first button hole and a second button hole. At least two light strips are attached to the side of the backboard, and two adjacent light strips are connected to each other and form a joint, and the first buttonhole and the second buttonhole are respectively formed adjacent to the left end of the two connected light bars and Right end. One end of the first fastening member abuts against the left end of the two connected light bars and the other end is embedded in the first fastening hole. One end of the second fastening member abuts against the right end of the two connected light bars and the other end is embedded in the second fastening hole. A tablet is formed on the side and abuts or snaps into the joint.

Another embodiment of the present invention provides a light source assembly including a back plate, a heat sink, at least two light bars, a first fastening component, a second fastening component, and a pressing piece. The back plate is disposed on a bottom side of a light guide plate. The heat sink is disposed at a position adjacent to a light incident surface of the light guide plate, the heat sink has a bottom portion and a side portion, and the bottom portion has at least one first button hole and a second button hole, and the bottom portion is connected to one side of the back plate and The side is clipped at an angle. At least two light bars are attached to the side of the heat sink, the two adjacent light bars are connected to each other and form a contact point, and the first button hole and the second button hole are respectively formed at positions adjacent to the left end and the right end of the two connected light bars. . One end of the first fastening member abuts against the left end of the two connected light bars and the other end is embedded in the first fastening hole. One end of the second fastening member abuts against the right end of the two connected light bars and the other end is embedded in the second fastening hole. A tablet is formed on the side and abuts or snaps into the joint.

In summary, the light source assembly of the embodiment of the present invention has at least one of the following advantages: the button hole is formed on the back plate or the heat sink by the design of the above embodiment, and the engaging effect of the snap member can be The light bar is firmly confined to the back plate or the heat sink, so that the warpage, peeling or peeling of the light bar on the back plate or the heat sink can be effectively avoided, and the quality and reliability of the light source component and the life and illumination of the light emitting component can be improved. The efficiency and the snap between the light guide plate and the light bar protect the light bar from being hit by the light guide plate. In addition, the component configuration and assembly work of the above design are relatively simple and rapid, so that the positioning enhancement effect can be additionally provided without causing an increase in cost. Furthermore, the bottom and the side of the backing plate or the heat sink can be at an angle to each other to form a T-shaped cross-sectional shape or an L-shaped cross-sectional shape, because the light bar can be attached to the T-shaped or L-shaped according to actual needs. The horizontal wall surface or the vertical wall surface of the cross section can be applied to light-emitting elements of different light-emitting directions.

Other objects and advantages of the present invention will become apparent from the technical features disclosed herein. The above and other objects, features, and advantages of the invention will be apparent from

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the embodiments of the invention. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

2 is a schematic view of a light source assembly according to an embodiment of the present invention, and FIGS. 3 and 4 are partial enlarged views M and N of FIG. Referring to FIG. 2 to FIG. 4 , the light source assembly 10 includes a back plate 12 and a light bar 14 . The back plate 12 includes a bottom portion 12 a and at least one side portion 12 b , and the back plate side portion 12 b is at an angle with the back plate bottom portion 12 a . In the present embodiment, the back plate side portion 12b and the back plate bottom portion 12a are, for example, perpendicular to each other, but the present invention is not limited to this embodiment. The light bar 14 is attached to the back side portion 12b. For example, the light bar 14 can be adhered to the back plate side portion 12b by a thermal tape 18. The light bar 14 has an elongated shape, and thus has a first end P and a second end Q in a long axis direction of the light bar 14. The light bar 14 has a plurality of light-emitting elements 141 arranged in a row, and a first connector 142 (connector) and a second connector 143 on the two sides of the light-emitting elements 141. The first connector 142, the first connector The two connectors 143 can, for example, distribute electrodes and circuit traces. In the embodiment, the bottom plate 12 a is formed with a first fastening hole 121 and a second fastening hole 122 . The first fastening hole 121 is adjacent to the first end P of the light bar 14 and the second fastening hole 122 is adjacent to the light bar 14 . Second end Q. One end of the first fastening member 22 abuts against the light bar 14 and the other end is embedded in the first fastening hole 121 . One end of the second fastening component 24 abuts the light bar 14 and the other end is embedded in the second fastening hole 122 . After the first fastening component 22 and the second fastening component 24 are respectively inserted into the first fastening hole 121 and the second fastening hole 122 of the bottom plate bottom 12a, the first fastening component 22 and the second fastening component 24 can respectively be respectively received. The opposite ends P, Q of the light bar 14 are used to obtain the effect of the limit light bar 14. Therefore, even if the heat-dissipating double-sided tape 18 between the light bar 14 and the back plate 12 is deteriorated or peeled off, the light bar 14 can be limited to the back plate 12 by the first fastening member 22 and the second fastening member 24. . Furthermore, since the first fastening component 22 and the second fastening component 24 are respectively embedded in the first fastening hole 121 and the second fastening hole 122, they are located between a light guide plate (not shown) and the light bar 14 . When the light guide plate is deformed by heat or displaced by external force or other factors, the first fastening member 22 and the second fastening member 24 can protect the light bar 14 from being struck by the light guide plate.

FIG. 5 is a schematic view of a snap fastener according to an embodiment of the present invention, and FIG. 6 is a schematic view showing a manner of engaging and snapping a snap fastener and a buckle hole. FIG. 5 and FIG. 6 illustrate the structure of the latching member by taking the first latching member 22 as an example. Since the second latching member 24 and the first latching member 22 have the same structural type, they will not be described herein. Referring to FIG. 5 and FIG. 6 , in one embodiment, the bottom of the first fastening component 22 has a T-shaped cross-shaped outer ferrule 221 , and the first fastening component 22 has a side facing the light bar 14 . A notch 222, so that when the latch 221 of the first latching member 22 is engaged with the first latching hole 121, the first latching member 22 can be firmly fixed on the bottom plate bottom portion 12a, and the first connector 142 is just right. The first fastening member 22 is placed in the notch 222 of the first fastening member 22 so that the first fastening member 22 can abut the light bar 14 to achieve the effect of the limiting light bar 14. In this embodiment, since the first connector 142 can be inserted into the notch 222 of the first fastening member 22, the effect of protecting the connector 142 can be further provided. Of course, the shape of the first fastening member 22 and the second fastening member 24 and the matching shape between the fastening holes and the fastening holes are not limited, and only the purpose of providing the engagement effect and reaching the limit light bar 14 can be achieved. Furthermore, the first fastening component 22 and the second fastening component 24 can be made of an elastic material, such as a plastic material.

FIG. 7 is a schematic diagram of a light source assembly according to another embodiment of the present invention. Here, in order to clearly show the connection state of the back plate 32 and the heat sink 36, the light guide plate 46 is indicated by a broken line. As shown in FIG. 7, the light source assembly 30 includes a back plate 32, a light bar 34, and a heat sink 36. The back plate 32 is disposed on a bottom side of the light guide plate 46. The heat sink 36 is disposed at a position adjacent to a light incident surface 46a of the light guide plate 46 and connects to a side of the bottom plane 32a of the back plate 32. The heat sink 36 has a bottom portion 36a and a side portion 36b, and the heat sink bottom portion 36a is at an angle to the heat sink side portion 36b. The light bar 34 is attached to the heat sink side portion 36b. For example, the light bar 34 can be adhered to the heat sink side portion 36b by a heat conductive double-sided tape 38. The light bar 34 has an elongated shape and thus has a first end S and a second end T in a long axis direction of the light bar 34. The light bar 34 has a plurality of light-emitting elements 341 which can be arranged in a row, and a first connector 342 and a second connector 343 which are located on both sides of the light-emitting elements 341. In the embodiment, the bottom portion 36a of the heat sink is formed with a first fastening hole 361 and a second fastening hole 362. The first fastening hole 361 is adjacent to the first end S of the light bar 34 and the second fastening hole 362 is adjacent to the light bar 34. Second end T. After the first fastening component 42 and the second fastening component 44 are respectively inserted into the first fastening hole 361 and the second fastening hole 362 of the heat sink bottom 36a, the first fastening component 42 and the second fastening component 44 can respectively be respectively received. The opposite ends S and T of the light bar 34 also obtain the effect of the limit light bar 34. In the embodiment, the light bar 34 is combined with the heat sink 36 and then connected to the back plate 32, which can effectively improve the structural strength and heat dissipation effect, and is easy to modularize. Of course, the outer shape of the heat sink 36 is not limited, and may have, for example, an L-shaped shape or a T-shaped cross-sectional shape.

FIG. 8 is a schematic diagram of a light source assembly according to another embodiment of the present invention. In the present embodiment, the light source assembly 70 includes two light bars 54a, 54b, and two adjacent light bars 54a, 54b are connected to each other and form a contact W. The two light bars 54a, 54b are attached to the side portion 76b of a heat sink 76, and the bottom portion 76a of the heat sink 76 is coupled to one side of the bottom of the back plate 52. The first fastening member 62, the second fastening member 64 and the third fastening member 66 are respectively embedded in the bottom portion 76a of the heat sink and abut the contact point W of the left end of the light bar 54a, the right end of the light bar 54b and the two light bars 54a, 54b. Also get good positioning results. Furthermore, as shown in the light source assembly 80 of FIG. 9, a pressing piece 82 can also be used to abut the intermediate indirect point W of the two connected light strips 54a, 54b, that is, the first fastening member 62 and the second fastening member. 64 and the pressing piece 82 can respectively abut the left end, the right end and the intermediate indirect point W of the two connected light bars 54a, 54b, so that a plurality of connected light bars 54a, 54b obtain a good positioning effect. of course. The above embodiment is equally applicable to the case where the light bar as shown in FIG. 2 is attached to the side of a backboard.

In summary, the light source assembly of the embodiment of the present invention has at least one of the following advantages: the button hole is formed on the back plate or the heat sink by the design of the above embodiment, and the engaging effect of the snap member can be The light bar is firmly confined to the back plate or the heat sink, so that the warpage, peeling or peeling of the light bar on the back plate or the heat sink can be effectively avoided, and the quality and reliability of the light source component and the life and illumination of the light emitting component can be improved. The efficiency and the snap between the light guide plate and the light bar protect the light bar from being hit by the light guide plate. In addition, the component configuration and assembly work of the above design are relatively simple and rapid, so that the positioning enhancement effect can be additionally provided without causing an increase in cost. Furthermore, the bottom and the side of the backing plate or the heat sink can be at an angle to each other to form a T-shaped cross-sectional shape or an L-shaped cross-sectional shape, because the light bar can be attached to the T-shaped or L-shaped according to actual needs. The horizontal wall surface or the vertical wall surface of the cross section can be applied to light-emitting elements of different light-emitting directions.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. 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 scope of the invention.

10. . . Light source assembly

12. . . Backplane

121, 122. . . Buckle hole

12a. . . Back plate bottom

12b. . . Back side

14. . . Light

141. . . Light-emitting element

142, 143. . . Connector

18. . . Thermal double-sided tape

221. . . Latch

222. . . gap

22, 24. . . Fastener

30. . . Light source assembly

32. . . Backplane

32a. . . Bottom plane

34. . . Light

341. . . Light-emitting element

342, 343. . . Connector

36. . . heat sink

361, 362. . . Buckle hole

36a. . . Heat sink bottom

36b. . . Heat sink side

38. . . Thermal double-sided tape

42, 44. . . Fastener

46. . . Light guide

46a. . . Light guide plate

70, 80. . . Light source assembly

52. . . Backplane

54a, 54b. . . Light

62, 64, 66. . . Fastener

76. . . heat sink

76a. . . Heat sink bottom

76b. . . Heat sink side

82. . . Tablet

100. . . Light source assembly

102. . . Backplane

104. . . Light

106. . . Thermal double-sided tape

P, Q, S, T. . . end

M, N. . . Partially enlarged view W contact

Figure 1 is a schematic illustration of a conventional light source assembly.

2 is a schematic view of a light source assembly according to an embodiment of the present invention, and FIGS. 3 and 4 are partial enlarged views M and N of FIG.

FIG. 5 is a schematic view of a snap fastener according to an embodiment of the present invention, and FIG. 6 is a schematic view showing a manner of engaging and snapping a snap fastener and a buckle hole.

FIG. 7 is a schematic diagram of a light source assembly according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of a light source assembly according to another embodiment of the present invention.

FIG. 9 is a schematic diagram of a light source assembly according to another embodiment of the present invention.

10. . . Light source assembly

12. . . Backplane

12a. . . Back plate bottom

12b. . . Back side

14. . . Light

141. . . Light-emitting element

142, 143. . . Connector

18. . . Thermal double-sided tape

22, 24. . . Fastener

P, Q. . . end

M, N. . . Partial enlargement

Claims (19)

A light source assembly comprising: a back plate having a bottom portion and at least one side portion, the side portion being at an angle to the bottom portion and the bottom portion being formed with at least one first button hole and a second button hole; a light bar, Attached to the side portion of the backboard, the light bar has an elongated shape and has a first end and a second end in a long axis direction, wherein the first button hole of the back plate Adjacent to the first end of the light bar and adjacent to the second end of the light bar; a first fastening member, one end abuts the light bar and the other end is embedded in the first fastening hole; The second fastening component has one end abutting the light bar and the other end being embedded in the second fastening hole. The light source assembly of claim 1, wherein the first fastening component and the second fastening component are made of an elastic material. The light source assembly of claim 1, wherein the first fastening component has at least one first latch, and the second fastening component has at least one second latch, the first latch is embedded in the first latching hole And the second latch is embedded in the second buttonhole. The light source assembly of claim 3, wherein the first card and the second card respectively have a T-shaped cross-sectional shape, and the first button hole and the second button hole respectively have a T-shape The cross-sectional shape. The light source assembly of claim 1, wherein the light bar has a plurality of light emitting elements and a first connector and a second connector disposed on opposite sides of the light emitting elements. The light source assembly of claim 5, wherein a side of the first fastening member facing the light bar has a first notch and the first notch accommodates the first connector, the second fastening member faces the One side of the light bar has a second gap and the second gap accommodates the second connector. The light source assembly of claim 1, further comprising a heat conductive double-sided tape disposed between the back plate and the light bar. A light source assembly includes: a back plate disposed on a bottom side of a light guide plate; a heat sink disposed at a position adjacent to a light incident surface of the light guide plate and connected to a side of the back plate, the heat dissipation The sheet has a bottom portion and a side portion, the bottom portion is formed with at least one first button hole and a second button hole, and the side portion is at an angle with the bottom portion; a light bar is attached to the side of the heat sink The first light-emitting strip has an opposite first end and a second end, wherein the first fastening hole of the heat sink is adjacent to the first end of the light bar and the second fastening hole Adjacent to the second end of the light bar; a first latching member having one end abutting the light bar and the other end of the first latching hole; and a second latching member having one end abutting the light bar and the other end Embedding the second buttonhole. The light source assembly of claim 8, wherein the first fastening component and the second fastening component are made of an elastic material. The light source assembly of claim 8, wherein the first fastening component has at least one first latch, and the second fastening component has at least one second latch, the first latch is embedded in the first latching hole And the second latch is embedded in the second buttonhole. The light source assembly of claim 10, wherein the first card and the second card respectively have a T-shaped cross-sectional shape, and the first button hole and the second button hole respectively have a T-shape The cross-sectional shape. The light source assembly of claim 8, wherein the light bar has a plurality of light emitting elements and a first connector and a second connector disposed on opposite sides of the light emitting elements. The light source assembly of claim 12, wherein a side of the first fastening member facing the light bar has a first notch and the first notch accommodates the first connector, the second fastening member faces the One side of the light bar has a second gap and the second gap accommodates the second connector. The light source assembly of claim 8, further comprising a heat conductive double-sided tape disposed between the heat sink and the light bar. The light source assembly of claim 8, wherein the heat sink has a T-shaped or L-shaped cross-sectional shape. A light source assembly includes: a back plate having a bottom portion and at least one side portion, the bottom portion being at an angle with the side portion, and the bottom portion having at least one first button hole, a second button hole and a third button a second light bar attached to the side of the back plate, the two adjacent light bars are connected to each other and form a contact, and the first button hole, the second button hole and the third button a hole is formed adjacent to the left end, the right end of the light bar and the contact point; a first fastening member, one end abuts against the left end of the light bar and the other end is embedded in the first button hole; The two latching members have one end abutting against the right end of the light strip and the other end being embedded in the second button hole; and a third latching member having one end abutting the contact point and the other end being embedded in the third button hole. A light source assembly includes: a back plate disposed on a bottom side of a light guide plate; a heat sink disposed at a position adjacent to a light incident surface of the light guide plate, the heat sink having a bottom portion and a side portion The bottom portion has at least one first button hole, a second button hole and a third button hole. The bottom portion is connected to one side of the back plate and is at an angle with the side portion. At least two light bars are attached to the heat dissipation. On the side of the strip, two adjacent strips are connected to each other and form a joint, and the first button hole, the second button hole and the third button hole are respectively formed adjacent to the two light strips connected to the light bar. a first latching member, one end abutting against the left end of the two light strips and the other end is embedded in the first buttonhole; a second latching member having one end abutting the two lights The right end of the strip and the other end are embedded in the second fastening hole; and a third fastening component, one end abuts the contact and the other end is embedded in the third fastening hole. A light source assembly includes: a back plate having a bottom portion and at least one side portion, the bottom portion being at an angle with the side portion, and the bottom portion having at least one first button hole and a second button hole; at least two light bars Attached to the side of the backboard, two adjacent light strips are connected to each other and form a joint, and the first buckle hole and the second buckle hole are respectively formed adjacent to the two light strips connected to the light strip. a first latching member, one end abutting against the left end of the light strip and the other end is embedded in the first button hole; a second latching member having one end abutting the right end of the two connected light strips And the other end is embedded in the second buttonhole; and a pressing piece is formed on the side portion and abuts or engages the contact point. A light source assembly includes: a back plate disposed on a bottom side of a light guide plate; a heat sink disposed at a position adjacent to a light incident surface of the light guide plate, the heat sink having a bottom portion and a side portion The bottom portion has at least one first buttonhole and a second buttonhole. The bottom portion is connected to one side of the backboard and is at an angle to the side portion. At least two light strips are attached to the side of the heat sink. Two adjacent light bars are connected to each other and form a contact point, and the first fastening hole and the second fastening hole are respectively formed adjacent to the left end and the right end of the two light bars; a first fastening component, one end Abutting the left end of the light bar and the other end is embedded in the first fastening hole; a second fastening component having one end abutting against the right end of the light bar and the other end being embedded in the second fastening hole; A tablet is formed on the side and abuts or engages the joint.