TW201409126A - Backlight module - Google Patents

Abstract

A backlight module includes a light guide plate, a light source module disposed along a light-entrance side of the light guide plate and including a circuit board with a plurality of light sources disposed thereon, a base, and a retaining clip. The base is disposed extending along the light-entrance side, wherein the circuit board is disposed on the base. The retaining clip holds the circuit board onto the base and is disposed between adjacent two of the light sources. The retaining clip has a first palate portion, and a second palate portion opposite to the first palate. A bend is formed on the first palate such that at least a portion of the first palate protrudes touching an end surface of the light-entrance side, and correspondingly maintains the gap between end surface of the light-entrance side and the light surface.

Description

Backlight module

The present invention relates to a backlight module; in particular, the present invention relates to a backlight module that uses a fixing clip to position a distance between a light source and a light guide plate.

Display devices, such as liquid crystal displays and other electronic products, have been widely used in life. With the demand for products such as display devices and the increasing competition among manufacturers in the market, manufacturers of display products are gradually starting to introduce display products with better image quality, and have become competitive products. The key factor.

The conventional backlight module of FIG. 1A includes a light source module 1, a base 4, a light guide plate 6, and a chassis 7. In the conventional backlight module, the light source module 1 is locked to the base 4 by a plurality of screws 5. The base 4 and the light guide plate 6 are locked to the chassis 7, and are disposed at a pitch. However, since the distance between the susceptor 4 and the light guide plate 6 is different during assembly, the quality of the light generated by the light source module 1 incident on the light guide plate 6 cannot be controlled in an optimal state, resulting in uneven brightness of the picture. . In addition, the distance between the light source module 1 and the light guide plate 6 is shifted during the conveyance of the display device, and the difficulty of controlling the brightness of the screen is increased.

An object of the present invention is to provide a backlight module that can reduce the visual impact of the distance between the light source and the light guide plate.

Another object of the present invention is to provide a backlight module capable of improving backlight Assembly time of the module.

The present invention provides a backlight module, comprising: a light guide plate having a light incident side; a light source module extending along the light incident side; wherein the light source module comprises a circuit board and a plurality of light sources are disposed on the circuit On the top surface of the board, the light sources are disposed along the light incident side, and each has a light emitting surface that emits light toward the light incident side; a base extends along the light incident side, wherein the circuit board is Provided on the base; and a fixing clip, the circuit board is clamped on the base and disposed between two adjacent light sources; wherein the fixing clip has a first one and a first side a second jaw portion, wherein the first jaw portion is formed with at least one bend such that at least a portion of the first jaw portion protrudes against the end surface of the light incident side and positions a relative distance between the end surface of the light incident side and the light emitting surface .

The invention is a backlight module with a compact structure and convenient assembly. In a preferred embodiment, the light source module used in the backlight module is a light emitting diode module (LED Module), and the light source is a light-emitting diode (LED). In addition, the backlight module of the present invention is preferably applied to a display device such as a liquid crystal display (LCD), but is not limited thereto; the backlight module can also be applied to other fields.

Please refer to a preferred embodiment of the backlight module 100 of the present invention shown in FIGS. 2A and 2B. As shown in FIG. 2A and FIG. 2B , the backlight module 100 includes a light guide plate 110 , a light source module 120 , a base 130 , and a fixing clip 140 . The light guide plate 110 has a light incident side 115 for the backlight generated by the light source module 120 to enter the light guide plate 110. In a preferred embodiment, the light source module 120 extends along the light incident side 115. The light source module 120 includes a plurality of light sources 122 and a circuit board 124. In this embodiment, a plurality of light sources 122 are disposed on the top surface 125 of the circuit board 124 along the light incident side 115, and each of the light emitting surfaces 123 emits light toward the end surface of the light incident side 115. The circuit board 124 is disposed on the base 130. The susceptor 130 is preferably a metal body having a heat dissipating function; however, in other different embodiments, the susceptor 130 may be formed of other materials. As shown in FIG. 2B, the traverse shape of the base 130 can be an "L" shape and has a bearing surface 132 and a gripping surface 134 opposite the bearing surface 132. In other words, the bearing surface 132 of the pedestal 130 faces one of the bottom surfaces 126 of the circuit board 124, and the nip surface 134 is opposite to one side of the circuit board 124 with respect to the bearing surface 132. In this embodiment, the top surface 125 of the circuit board 124 faces the end surface of the light incident side 115 of the light guide plate 110. The fixing clip 140 is used for clamping the circuit board 124 on the base 130 and positioning the relative distance between the light incident side 115 of the light guide plate 110 and the light emitting surface 123 of the light source module 120.

In a preferred embodiment, the fixing clips 140 are preferably made of a metal or the like so that the fixing clips 140 have sufficient elasticity and clamping force, and at the same time have a heat dissipating function; however, the material of the fixing clips 140 is not limited thereto. . In other various embodiments, the clips 140 can also be made of other materials. As shown in FIG. 2A and FIG. 2B, the fixing clip 140 includes a first crotch portion 141 and a second crotch portion 146, wherein at least one bend 142 is formed on the first crotch portion 141. In the present embodiment, the backlight module 100 of the present invention clamps the light source module 120 to the susceptor 130 by the first dam portion 141 and the second dam portion 146 of the fixing clip 140.

2C is a preferred embodiment of the fixing clip 140 of FIG. 2A and 2B sandwiching the light source module 120 and the base 130. As shown in FIGS. 2A to 2C, when the light source module 120 and the susceptor 130 are clamped together by the fixing clips 140, the circuit board 124 The bottom surface 126 is closely parallel to the bearing surface 132 of the base 130. The first side portion 141 and the second side portion 146 of the fixing clip 140 respectively correspond to the top surface 125 of the pressing circuit board 124 and the base 130. The clamping surface 134 is configured to sandwich the light source module 120 with the base 130. In addition, in the embodiment, the first dam portion 141 of the fixing clip 140 is preferably at least partially resisted by the bending 142 to facilitate the fixing of the fixing clip 140 during the assembly process of the backlight module 100. It is positioned around the base 130 and the light source module 120.

As shown in FIGS. 2A to 2C, the first weir portion 141 of the fixing clip 140 includes a first segment 145 located before the bend 142 and a second segment 143 located after the bend 142, wherein the first segment 145 is connected. Second 146. In this embodiment, the first segment 145 of the first weir portion 141 presses the top surface 125 of the circuit board 124, and the second segment 143 protrudes from the light emitting surface 123 of the light source module 120 toward the light guide plate 110. And parallel to the end surface of the light incident side 115 of the light guide plate 110. With the design, the fixing clip 140 can clamp the light source module 120 on the base 130, and at the same time, the light incident side 115 of the light guide plate 110 and the light emitting surface 123 of the light source 122 are separated by a distance g, so that the backlight module 100 Can maintain a good light source effect. In this embodiment, since the first weir portion 141 is formed in a U shape by bending 142, the first weir portion 141 has a certain elasticity to be pressed against the end surface of the light incident side 115 of the light guide plate 110. . In other words, in the present embodiment, the first dam portion 141 of the fixing clip 140 prevents the light-emitting surface 123 of the light source 122 from being damaged by the vibration or displacement of the light guide plate 110 by the "U"-shaped structure, and Because the U-shaped structure has a certain elasticity, the end surface of the light-incident side 115 of the light guide plate 110 is scratched and damaged by the first crotch portion 141 of the fixing clip 140 when the light guide plate 110 is vibrated or displaced. In addition, the diameter of the fixing clip 140 can be adjusted according to the design requirements. In order to increase the clamping force, elasticity and/or the relative distance g between the light incident side 115 and the light emitting surface 123.

Figure 2D is another preferred embodiment of Figure 2C. As shown in FIGS. 2A and 2D, the base 130 may further include a recess 136, wherein the recess 136 is formed on the clamping surface 134 of the base 130. An inner protrusion 147 is formed on the second dam portion 146 of the fixing clip 140 and is recessed into the groove 136. The inner protrusion 147 is the apex of the second dam portion 146 protruding toward the first dam portion 141. In this embodiment, The inner protrusion 147 is formed by bending the second weir portion 146; however, it is not limited thereto. In other various embodiments, the inner protrusion 147 can also be a bump on the second jaw 146. When the inner protrusion 147 is recessed into the groove 136 of the base 130, it is pressed against the bottom surface of the groove 136. In the present embodiment, the bottom surface of the recess 136 is parallel to the bearing surface 134; however, it is not limited thereto. In other various embodiments, the bottom surface of the recess 136 may conform to the shape of the inner protrusion 147 of the retaining clip 140, or may contact the inner protrusion 147 by other shapes. The inner protrusion 147 of the second portion 146 is recessed in the recess 136, so that the fixing clip 140 can be firmly positioned on the base 130 and the light source module 120, and the fixing clip 140 can be prevented from being separated upward from the base 130 and the light source. A combination of modules 120.

2E is a perspective view of another preferred embodiment of FIG. 2C (or 2D). As shown in FIG. 2E , the light source module 120 has a plurality of light sources 122 and at least two fixing clips 140 , wherein the light sources 122 are disposed on the top surface 125 of the circuit board 124 . In this embodiment, the fixing clip 140 is a flat type fixing clip having a width, and the width and thickness thereof can be adjusted according to design requirements. As shown in FIG. 2E, the fixing clips 140 are disposed between two adjacent light sources 122, and no fixing clips 140 are disposed between the two adjacent light sources 122 between the two fixing clips 140. In essence, as long as the fixing clip 140 is disposed between any two adjacent light sources 122 The fixing clip 140 is clamped to the light source module 120 on the base 130. However, the fixing clips 140 may be distributed between two adjacent light sources 122 at two ends of the light source module 120 according to design requirements, or may be disposed between any two adjacent light sources 122 in other distribution manners to achieve energy distribution. The light source module 120 is clamped on the base 130. Figure 2F is another preferred embodiment of Figure 2E. As shown in FIG. 2F, the fixing clip 140 can also be a pole shape, and the radius can be adjusted according to design requirements. However, in other different embodiments, the clips 140 can also be presented in other types, such as a polygonal shape.

Figure 2G is a preferred embodiment of the back side of Figures 2E through 2F. As shown in FIG. 2G, the recess 136 can be disposed at a specific position such that when each of the retaining clips 140 is disposed between the two adjacent light sources 122, the retaining clips 140 can be simultaneously positioned to avoid the retaining clips 140. The position of the upper, lower, left or right is separated from the positioning due to the vibration or external force of the combination of the light source module 120 and the base 130. In addition, by this design, during assembly, the assembler can quickly and easily trap the inner protrusion 147 of the fixing clip 140 into the groove 136 by merely finding the position of the groove 136 by the touch of the finger. So that the time required for assembly can be reduced.

However, as shown in FIG. 2H, in another preferred embodiment, the recess 136 can also be formed along the light source module 120 on the bearing surface 134. According to this design, the number and/or distribution position of the fixing clips 140 can be adjusted according to design requirements, and can simultaneously prevent the fixing clips 140 from coming off the combination of the light source module 120 and the base 130.

3A to 3D are examples of four other preferred embodiments of the retaining clip 140, wherein the four retaining clips will be described in conjunction with the embodiments of Figs. 2A and 2C; however, it should be noted that the four retaining clips are not For use in conjunction with the embodiment of FIG. 2C, the four types of fastening clips can be used in conjunction with any of the embodiments of FIGS. 2A through 2H.

As shown in FIGS. 2C and 3A, the first section 145 of the first jaw 141 of the retaining clip 140 of FIG. 3A is pressed against the top surface 125 of the circuit board 124, and the second section 143 is protruded from the bend 142. In the light-emitting surface 123 of the light source 122 of the light source module 120 of FIG. 2C, an end 144 is in contact with the end surface of the light-incident side 115 of the light guide plate 110. In other words, the fixing clip 140 can sandwich the light source module 120 on the base 130 by the first segment 145 and the second weir portion 146 of the first weir portion 141, and only by the second segment 143 of the first weir portion 141 It is in contact with the end face of the light incident side 115. With this design, since the first segment 145 does not protrude from the light emitting surface 123 of the light source 122, and since the second segment 143 protruding horizontally from the plane of the light emitting surface 123 is perpendicular to the light emitting surface 123, the second segment 143 interferes with the self-luminous The light generated by face 123 will be lower. In other words, in this case, the fixing clip 140 can reduce the influence of the light incident on the self-illuminating surface 123 on the light side 115, so that the light can be efficiently incident into the light guide plate 110 and at the same time, the light emitting surface 123 and the light entering the light can be positioned at the distance g. The distance between the sides 115.

As shown in FIGS. 2C and 3B, with respect to the retaining clip 140 of FIG. 3A, the second section 143 of the retaining clip 140 of FIG. 3B is self-bent 142 and is toward the top surface 125 of the circuit board 124. Specifically, in the present embodiment, the second segment 143 extends toward the circuit board 124 and interferes with the top surface 125 of the circuit board 124 with the end 144. In other words, the fixing clip 140 only connects the light source module 120 and the base 130 together by the end 144 of the first weir portion 141 and the second weir portion 146. This design has the advantage that the area where the fixing clip 141 and the circuit board 124 touch each other can be reduced to reduce the influence of the fixing clip 140 on the circuit of the circuit board 124, and at the same time the distance of the second section 143 (ie, the distance g) The distance between the light emitting surface 123 of the light source module 120 and the light incident side 115 of the light guide plate 110 is located.

As shown in FIGS. 2C and 3C, in the present embodiment, the bend 142 of the first weir portion 141 of the fixing clip 140 protrudes toward the end surface of the light incident side 115 of the light guide plate 110 to form a ridge. In this embodiment, the fixing clip 140 is in contact with the light incident side 115 of the light guide plate 110 by the ridge (bend 142), and is the end 144 and the second end of the second segment 143 of the first weir portion 141. The portion 146 sandwiches the light source module 120 on the base 130. By this design, since the first ridge portion 141 only abuts the light incident side 115 of the light guide plate 110 by the ridge 142, and only contacts the light source by the end 144 of the second end 143 of the first dam portion 141. The top surface 125 of the circuit board 124 of the module 120, the fixing clip 140 of the embodiment can reduce the area of the light entering the light side 115 and the circuit board 124, so as to reduce the incidence of light generated by the fixing clip 140 to the light source module 120. The case of entering the light side 115. Moreover, in the present embodiment, the retaining clip 140 substantially interferes with the top surface 125 of the circuit board 124 by the corner of the end 144 of the second section 143 of the first jaw 141; however, in other different embodiments The plane of the end 144 of the second segment 143 may be parallel to the top surface 125 of the circuit board 124 and may be in contact with the top surface 124 by the end 144 that is parallel to the top surface 124.

As shown in FIG. 2C and FIG. 3D, after the second segment 143 of the first weir portion 141 is bent 142, it forms a bellows-shaped structure and abuts against the light-incident side of the light guide plate 110. 115. By the folding of the second segment 143, the fixing clip 140 can increase the distance of the distance g between the light emitting surface 123 and the light incident side 115. This has the advantage that the fixing clip 140 can be adjusted by only the folding of the second section by increasing its diameter width or thickness. With this design, since the diameter width of the fixing clip 140 does not need to be increased, the fixing clip 140 has a low influence on the light incident side 115 of the light guide plate 110. In addition, the fold of the second section 143 can provide solid The clip 140 has more spring force for the shock absorption effect between the circuit board 124 and the light guide plate 110. In the present embodiment, the second segment 143 forms only one fold; however, in other different embodiments, the second segment 143 can also be folded multiple times so that the distance g and the damping effect can be adjusted according to design requirements.

The foregoing embodiments of FIGS. 2A to 2H are the case where the top surface 125 of the circuit board 124 of the light source module 120 faces the light incident side 115 of the light guide plate 110. The case where the top surface 125 of the circuit board 124 does not face the light incident side 115 will be described below.

Figure 4A is another preferred embodiment of Figure 2C. As shown in FIG. 4A, in the present embodiment, the light emitting surface 123 of the light source 122 is perpendicular to the top surface 125 of the circuit board 124, wherein the second portion 143 of the first side portion 141 is opposite to the light incident side 115 of the light guide plate 110. End face. As shown in FIG. 4A, the second segment 143 of the first weir portion 141 is folded back relative to the first segment 145 to the light guide plate 110 to be parallel to the first segment 145, and the end 144 of the second segment 143 is extended toward the light incident side 115. The end face 144 is in contact with the end face of the light incident side 115. By this design, the fixing clip 140 can position the distance between the light emitting surface 123 and the light incident side 115, and can simultaneously clamp the light source module 120 on the base 130. In addition, in other different embodiments, the combination of the light source module 120 and the pedestal 130 in FIG. 4A can also be implemented in combination with any of the fixing clips 140 of FIGS. 3A to 3D.

Figure 4B is another preferred embodiment of Figure 4A. As shown in FIG. 4B, the base 130 includes a bearing surface 132 and two clamped surfaces 134A and 134B. The circuit board 124 of the light source module 120 is disposed on the bearing surface 132 and includes a light source 122 having a light emitting surface 123 facing the light entering side 115. As shown in FIG. 4B, the bottom surface 126 of the circuit board 124 is parallel to the bearing surface 132. In this embodiment, the fixing clip 140 includes a connecting portion 149 for connecting the first jaw portion 141 and the second jaw portion, respectively. 146. The first jaw portion 141 and the second jaw portion 146 respectively press the two clamped surfaces 134A and 134B. The connecting section 149 spans the top surface of the circuit board 124 to position the circuit board 124 on the base 130. In this embodiment, the second portion 143 of the first dam portion 141 of the fixing clip 140 is in contact with the end surface of the light-incident side 115 of the light guide plate 110 to achieve the light-emitting surface 123 and the light guide plate 110 capable of positioning the light source module 120. The distance between the light incident sides 115.

In addition, according to the design requirements, in other different embodiments, the combination of the light source module 120 and the pedestal 130 of FIG. 4B can also be implemented in combination with the fixing clips of one of FIGS. 3A to 3D, so as to achieve effective use. The advantages of the clip.

The present invention has been described by the above-described related embodiments, but the above embodiments are only intended to implement the scope of the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, modifications and equivalents of the spirit and scope of the invention are included in the scope of the invention.

G‧‧‧distance

1‧‧‧Light source module

2‧‧‧Substrate

3‧‧‧Light source

4‧‧‧Base

5‧‧‧ screws

6‧‧‧Light guide plate

100‧‧‧Backlight module

110‧‧‧Light guide plate

115‧‧‧light side

120‧‧‧Light source module

122‧‧‧Light source

123‧‧‧Lighting surface

124‧‧‧Circuit board

125‧‧‧ top surface

126‧‧‧ bottom

130‧‧‧Base

132‧‧‧ bearing surface

134‧‧‧Clamped surface

134A‧‧‧ gripped surface

134B‧‧‧ gripped surface

136‧‧‧ Groove

140‧‧‧fixed clip

141‧‧‧First Department

142‧‧‧ bend

143‧‧‧ second paragraph

144‧‧‧ bend

145‧‧‧ first paragraph

146‧‧‧ Second Ministry

147‧‧‧Inside

149‧‧‧ Connection section

1A is a schematic view of a conventional backlight module; FIG. 1B is a schematic diagram of a conventional light source module; FIGS. 2A to 2C are schematic diagrams showing an embodiment of a backlight module of the present invention; and FIG. 2D is a backlight module having a groove; Figure 2E is a schematic view of another embodiment of Figure 2C; Figure 2F is a schematic view of another embodiment of Figure 2E; Figure 2G is a schematic view of another embodiment of Figure 2C; Figure 2H is another embodiment of Figure 2G 3A is a schematic view of one embodiment of a fixing clip; FIG. 3B is a schematic view of another embodiment of a fixing clip; FIG. 3C is a top view of an embodiment of a moving image display range of the display device; FIG. FIG. 4A is a schematic view of another embodiment of a backlight module; and FIG. 4B is a top view of an embodiment of a display image of a moving image of the display device.

100‧‧‧Backlight module

110‧‧‧Light guide plate

115‧‧‧light side

120‧‧‧Light source module

122‧‧‧Light source

123‧‧‧Lighting surface

124‧‧‧Circuit board

125‧‧‧ top surface

126‧‧‧ bottom

130‧‧‧Base

132‧‧‧ bearing surface

134‧‧‧Clamped surface

140‧‧‧fixed clip

Claims (19)

A backlight module includes: a light guide plate having a light incident side; a light source module extending along the light incident side; wherein the light source module comprises a circuit board and a plurality of light sources are disposed at the top of the circuit board The light source is disposed along the light incident side, and each has a light emitting surface that emits light toward the light incident side; a base extends along the light incident side, wherein the circuit board is disposed on the light source side And a fixing clip for clamping the circuit board on the base and disposed between two adjacent light sources; wherein the fixing clip has a first first portion and a second side And forming at least one bend on the first weir portion such that at least a portion of the first weir portion protrudes against the end surface of the light incident side and positions a relative distance between the end surface of the light incident side and the light emitting surface. The backlight module of claim 1, wherein the portion of the first crotch portion that is in contact with the light incident side end surface protrudes outside the light emitting surface toward an end surface of the light incident side. The backlight module of claim 1, wherein the pedestal comprises a bearing surface and a clamping surface opposite to the bearing surface, and the bottom surface of the circuit board is parallelly attached to the bearing surface, the first 颚The second portion and the second portion respectively press the top surface of the circuit board and the clamped surface to clamp and position the circuit board on the base. The backlight module of claim 3, wherein a groove is formed on the surface to be clamped, and an inner protrusion is formed on the second crotch portion to be trapped in the groove. The backlight module of claim 3, wherein the light emitting surface and the top surface of the circuit board face the light incident side end surface, the first side portion includes a first segment located before the bending and is located at the curved portion Folding one of the second segments; the first segment is connected to the second crotch portion, one of the first segment and the second segment protrudes against the end face of the light incident side, and the other presses the top surface of the circuit board . The backlight module of claim 5, wherein the second segment extends from the bend toward the light-incident end surface and abuts the light-incident end surface with the end portion, the first segment pressing the top surface of the circuit board . The backlight module of claim 5, wherein the second segment is folded back toward the light guide plate relative to the first segment to be parallel to the first segment, and the outer side of the second segment is parallel and resists the light entering. Side end face. The backlight module of claim 5, wherein the second segment forms a bellows-shaped structure and overlaps the light-incident side end surface. The backlight module of claim 5, wherein the second segment extends from the bend toward a top surface of the circuit board and abuts against a top surface of the circuit board at an end, the first segment protruding outwardly against the light incident side End face. The backlight module of claim 3, wherein the bending portion protrudes toward the light incident side end surface to form a ridge that is in contact with the light incident side end surface. The backlight module of claim 3, wherein the light emitting surface is perpendicular to a top surface of the circuit board, the first side portion includes a first portion before the bending and one of the bending portions a second segment; the first segment is connected to the second crotch portion, and the second segment is in contact with the end face of the light incident side. The backlight module of claim 11, wherein the second segment is folded back toward the light guide plate opposite to the first segment to be parallel to the first segment, and the end of the second segment extends toward the light-incident end surface and The end face is in contact with the light incident side end face. The backlight module of claim 1, wherein the base comprises a bearing surface and two clamping surfaces respectively connected to opposite sides of the bearing surface, and the bottom surface of the circuit board is parallelly attached to the bearing surface, the fixing The clip includes a connecting portion respectively connecting the first jaw portion and the second jaw portion, wherein the first jaw portion and the second jaw portion respectively press the two clamped surfaces, and the connecting portion spans the circuit board The top surface is positioned to position the circuit board on the base. The backlight module of claim 13, wherein the light emitting surface is perpendicular to a top surface of the circuit board, the first side portion includes a first segment before the bending and one of the bending portions a second segment; the first segment is connected to the first connecting segment, and one of the first segment and the second segment protrudes against the end face of the light incident side, and the other presses the clamped surface. The backlight module of claim 14, wherein the second segment is from the bend toward The light incident side end surface extends and abuts against the light incident side end surface with the end portion, and the first segment presses the clamped surface. The backlight module of claim 14, wherein the second segment is folded back to the light guide plate opposite to the first segment to be parallel to the first segment, and the outer side of the second segment is parallel and interferes with the light entering. Side end face. The backlight module of claim 14, wherein the second segment forms a bellows-shaped structure and overlaps the light-incident side end surface. The backlight module of claim 14, wherein the second segment extends from the bend toward the clamped surface and abuts the clamped surface with an end, the first segment protruding outwardly against the light incident side End face. The backlight module of claim 13, wherein the bending portion protrudes toward the light incident side end surface to form a ridge that is in contact with the light incident side end surface.